The Top 5 Costly Mistakes New Collectors Make With Ancient Roman Coins: Lessons From Lordmarcovan’s Twelve Caesars Collection

We all stumble when we first start collecting ancient coins—I know I did. But some stumbles cost a lot more than others. Let me help you sidestep the most expensive traps, using a remarkable real-world example as our guide.

When I first examined lordmarcovan’s Twelve Caesars collection in Fall 2025, I was struck by something that went far beyond the impressive lineup of silver denarii, bronze sestertii, and gold aurei spanning from Julius Caesar to Domitian. What gripped me most was the invisible story behind the set: years of hard-won knowledge, costly lessons absorbed, and the quiet expertise that only comes from making mistakes and surviving them. He recently sold the complete collection for $16,000 to a longtime numismatic friend—and while that price tag caught my attention, the real value lies in what this set teaches us about what not to do when building a world-class collection on a real-world budget.

I’ve spent decades in this hobby, examining thousands of ancient coins from battered bronzes to museum-quality aurei. If there’s one truth I’ve internalized, it’s this: the gap between a smart collector and an expensive beginner usually comes down to avoiding just five critical errors. Let me walk you through them, using lordmarcovan’s Twelve Caesars collection as our roadmap. These are the traps that can turn a $500-per-coin budget into a $1,500-per-coin nightmare faster than you can say pecunia non olet.

Mistake #1: Buying Cleaned Coins Without Knowing It

This is the silent killer of ancient coin collections, and it’s the mistake I see most often among enthusiastic beginners drawn to the Twelve Caesars theme. The appeal is obvious: you want a complete set of coins representing the rulers from Julius Caesar through Domitian. You find a dealer or an online listing offering a Tiberius denarius or a Nero aureus at what seems like a reasonable price. The coin looks bright, shiny, attractive. You buy it. And you’ve just made an expensive error.

Here’s the uncomfortable truth about ancient coins: original surface matters more than almost anything else. A cleaned coin—even one expertly cleaned by a professional—has had its original patina stripped or altered. That patina is the accumulated layers of oxidation and mineral deposits built up over two millennia. It’s what gives an ancient coin its authenticity, its character, and a significant portion of its numismatic value.

What Cleaning Looks Like on Roman Coinage

Cleaning takes many forms, and not all of them are obvious to the untrained eye:

• Light brushing or dipping: This removes the outermost layers of patina, leaving the coin unnaturally bright. On a silver denarius like the Tiberius “Tribute Penny” in lordmarcovan’s collection, a cleaned coin will appear almost white rather than the deep, multi-toned gray that serious collectors prize.
• Abrasive cleaning: This leaves visible scratches or a “wiped” look on the surface. Consider a Vespasian denarius—an abrasive-cleaned specimen will have a flat, lifeless quality to the metal that kills both eye appeal and collectibility.
• Chemical cleaning: Harsh acids can strip a coin down to bare metal, destroying fine details in the portrait and lettering. On a bronze sestertius like the Claudius in the collection, chemical cleaning can turn a rich chocolate brown surface into an ugly, pitted orange.
• “Tooled” cleaning: Some cleaners go further, using fine tools to re-engrave details or remove spots. This is particularly destructive on gold aurei like the Nero and Titus coins, where the soft metal shows every intervention and the luster is permanently compromised.

Lordmarcovan’s collection is notable because the coins clearly display honest, original surfaces. His Titus elephant aureus, which cost approximately $3,500 and is one of the crown jewels of the set, would be worth a fraction of that price if it had been cleaned. That single coin illustrates the point perfectly: a cleaned aureus might retail for $800–$1,200, while an uncleaned, attractively patinated example with strong eye appeal can command $3,000–$5,000 or more, depending on strike quality and overall condition.

How to Protect Yourself

Here’s my actionable advice for any collector building a Twelve Caesars set or any ancient collection:

1. Buy from dealers who guarantee original surfaces. Reputable ancient coin dealers—particularly those vetted by the International Association of Professional Numismatists (IAPN)—will explicitly state if a coin has been cleaned.
2. Learn to recognize natural patina. Silver should show layered toning, not uniform brightness. Bronze should have a stable, even surface—often brown, green, or a combination. Gold should have a rich, warm color with no dull or chalky patches.
3. When in doubt, walk away. There will always be another coin. The Twelve Caesars theme has been popular for centuries, and examples come to market regularly. Patience is your greatest asset.

“The Tiberius Tribute Penny in my collection was essentially free to me despite its later $1,000 appraisal by Ephesus Numismatics. I got such a great deal because I knew what to look for—and what to avoid.” — lordmarcovan

Mistake #2: Overpaying for Common Dates

This mistake is particularly insidious because it feels so logical. You want a coin of Augustus, so you buy the first decent Augustus denarius you find. You want a Nero aureus, so you pay the asking price for the first one that comes along. The problem? Not all emperors are created equal in the marketplace, and not all issues within an emperor’s reign carry the same price tag.

The Common-Date Trap in Roman Coinage

Rome minted coins for decades under some emperors and mere months under others. Augustus ruled for over 40 years, and his denarii were produced in enormous quantities. Titus, by contrast, ruled for only about two years (79–81 AD), and his gold aurei are genuinely scarce. The math is straightforward: more supply equals lower prices, all else being equal.

But here’s where beginners get tripped up. They assume that because all twelve Caesars are historically significant, all twelve should cost roughly the same. Lordmarcovan himself noted that his first Twelve Caesars collection was built with a $500-per-coin ceiling—a budget that’s entirely realistic for rulers like Augustus, Claudius, or Vespasian, but virtually impossible for Galba, Otho, or Vitellius, whose reigns were so short that their coins are genuinely rare varieties commanding serious premiums.

Consider the numbers from lordmarcovan’s own experience. He spent approximately $3,500 on the Titus elephant aureus alone. His Nero aureus and Julius Caesar lifetime denarius accounted for most of another $4,500. That’s $8,000 for three coins out of twelve. The remaining nine coins—including many from longer-reigning emperors—accounted for roughly $8,000 more. That’s an average of under $900 per coin for rulers like Tiberius, Caligula, Claudius, Galba, Otho, Vitellius, Vespasian, and Domitian.

How to Budget Smartly for a Twelve Caesars Set

Here’s a realistic price framework based on current market conditions for problem-free, attractively toned examples in VF (Very Fine) to XF (Extremely Fine) condition:

• Budget-friendly rulers (under $500–$800 in VF): Augustus (common denarii), Claudius (common bronzes), Vespasian, Domitian
• Mid-range rulers ($500–$1,500 in VF): Tiberius (the Tribute Penny is common but perpetually in demand), Caligula (bronze), Nero (silver)
• Expensive rulers ($1,000–$3,000+ in VF): Galba, Otho, Vitellius (all from the Year of the Four Emperors, 69 AD, with very short reigns), Julius Caesar (lifetime issues)
• Gold aurei (always premium): Nero aureus ($3,000+), Titus aureus ($3,500+ for desirable types like the elephant)

The key takeaway: don’t try to spend the same amount on every coin. Allocate your budget strategically. Spend less on common issues so you can afford the scarce ones. This is exactly how lordmarcovan built his set successfully—and how collectors who report spending over $1,500 on just three coins in VF could have saved significantly by being more selective about which types and varieties they pursued.

Mistake #3: Trusting Bad Holders and Misattributed Coins

In the modern coin world, we’re accustomed to third-party grading services like PCGS and NGC encapsulating coins in tamper-evident holders with certified grades. The ancient coin market operates differently, and this difference is a minefield for unwary collectors.

The Problem With Ancient Coin Authentication

Ancient coins are not typically slabbed by major grading services in the same way modern coins are. While NGC does offer an ancient coin certification service (NGC Ancients), many ancient coins in circulation are housed in:

• Simple cardboard flips with handwritten or printed labels — these offer no authentication whatsoever
• Dealer-provided holders with attributions — these are only as reliable as the dealer
• Old collection holders with outdated attributions — scholarship evolves, and coins attributed decades ago may be misidentified

I’ve examined ancient coins in collections where the ruler was misidentified, the denomination was wrong, or—worst of all—the coin was a modern forgery. This is not a theoretical risk. The market for high-quality ancient coin forgeries, particularly from Eastern Europe and the Middle East, is thriving.

Red Flags to Watch For

When evaluating any ancient Roman coin, especially for a thematic collection like the Twelve Caesars, watch for these warning signs:

• Unrealistic prices: If someone is offering a Galba denarius or an Otho denarius for $200, something is very wrong. These are genuinely scarce coins that typically retail for $800–$2,000+ in collectible condition.
• Perfect surfaces on a supposedly ancient coin: Two thousand years of burial leave marks. A coin that looks like it was struck yesterday is either cleaned, a modern production, or a cast forgery.
• Inconsistent style or lettering: Roman mints had distinctive styles. A Tiberius denarius should look different from a Nero denarius. If the portrait style, letter forms, or overall fabric seem off, consult an expert.
• Unprovenanced coins from recent “hoards”: Be especially wary of large quantities of ancient coins appearing on the market from unknown sources. While legitimate hoards do surface, so do groups of forgeries.

Lordmarcovan’s collection benefited from careful sourcing and a network of trusted dealers and fellow collectors. His decision to sell the collection intact to a trusted friend—rather than breaking it up—actually preserved the integrity of the set and ensured that each coin’s authenticity and provenance remained documented. When you buy ancient coins, provenance is your best friend.

Mistake #4: Falling for Marketing Hype and Impulse Buying

The Twelve Caesars theme is one of the most marketable concepts in all of numismatics. It’s been collected for centuries. It’s historically significant. It’s accessible to beginners. And it’s heavily marketed. Every major auction house, every ancient coin dealer, and every online marketplace knows that “Twelve Caesars” is a phrase that sells coins.

How Marketing Inflates Prices

I’ve seen identical coins—same emperor, same type, same condition, same mint quality—priced dramatically differently depending on how they’re marketed:

• A Tiberius denarius labeled generically: $400–$600
• The same Tiberius denarius labeled “The Tribute Penny — The Coin of the Bible”: $700–$1,200
• The same coin in a dealer’s “Twelve Caesars” showcase with a premium holder: $900–$1,500

Is the coin any different? Of course not. But the marketing creates a perception of scarcity and significance that drives prices upward. The “Tribute Penny” premium is a perfect example. Yes, the Gospel of Mark mentions a “penny” (denarius) shown to Jesus, and tradition holds that it was a Tiberius denarius. But the gospel doesn’t specify the denomination, and even if it did, millions of Tiberius denarii were struck. There is nothing inherently special about any individual Tiberius denarius that makes it the biblical coin.

The Auction Frenzy Trap

Online auctions, particularly on platforms where bidding wars can escalate quickly, are another breeding ground for overpayment. I’ve watched collectors get caught up in the excitement of completing their Twelve Caesars set and bid $1,500 for a coin that’s readily available elsewhere for $600. The urgency of “I need this one to finish my set” overrides rational pricing judgment.

Here’s my rule of thumb: never buy a coin in the heat of the moment. If you see something you want, bookmark it, research comparable sales, and come back in 48 hours. If the coin is still available and you still want it at the same price, buy it. If it’s gone, there will be another. The Twelve Caesars collection is a marathon, not a sprint.

Lordmarcovan’s own experience illustrates this perfectly. He built his first Twelve Caesars set on a $500-per-coin budget—a disciplined approach that required patience and restraint. His second set, which included two gold aurei and cost roughly $16,000 assembled over time, reflected years of careful acquisition rather than impulse buying. The result was a collection with genuine eye appeal and historical coherence that he was proud to present in a detailed video and ultimately sell as a complete, desirable set.

Mistake #5: Ignoring Historical Context and Educational Value

This final mistake is less about money and more about the soul of collecting—but it has financial implications too. Many new collectors approach the Twelve Caesars theme as a checklist: get one coin for each ruler, fill the slots, done. This approach produces a collection that’s technically complete but intellectually hollow, with limited numismatic value beyond the sum of its parts.

Why History Matters for Value

The collectors who build the most valuable Twelve Caesars collections—both in monetary and scholarly terms—are the ones who understand why these coins matter. Consider the coins in lordmarcovan’s set:

• Julius Caesar, lifetime issue denarius (44 BC): Struck during Caesar’s lifetime, this coin represents the moment when Rome’s republican coinage tradition shifted toward imperial portraiture. It’s not just “the Caesar coin”—it’s a revolutionary artifact in the history of money.
• Augustus cistophorus from Ephesus (ca. 25–20 BC): This regional issue reflects Augustus’s complex relationship with the eastern provinces and the continuation of local mint traditions under imperial authority.
• Tiberius denarius (the “Tribute Penny”): Whether or not it’s the actual coin from the Gospels, this type connects Roman economic history to the birth of Christianity.
• Nero aureus (54–68 AD): Nero’s gold coinage documents his increasingly erratic reign and the monetary reforms that followed.
• Galba, Otho, and Vitellius denarii (69 AD): Together, these three coins tell the story of the Year of the Four Emperors, one of the most dramatic chapters in Roman history. Each ruler’s coinage is brief, scarce, and historically charged.
• Titus aureus, elephant type (80–81 AD): Struck to commemorate the opening of the Colosseum, this coin links directly to one of the most iconic structures in human history—a provenance story that elevates its collectibility enormously.

When you understand these stories, you make better buying decisions. You know that the Titus elephant aureus is worth a premium because of its historical significance. You know that Galba, Otho, and Vitellius deserve higher budgets because their coins are genuinely scarce. You know that a common Augustus denarius doesn’t need to be a showpiece—it just needs to be honest and well-chosen.

The Educational Payoff

Lordmarcovan’s collection demonstrates this beautifully. His video presentation of the set—despite his self-deprecating comments about minor errors—is essentially a two-thousand-year history of Rome told through twelve coins. That educational depth is what makes a collection truly valuable, both to the collector and to any future buyer.

Here’s my advice: before you buy a single coin for your Twelve Caesars set, read a good history of the period. Suetonius’s The Twelve Caesars is the obvious starting point, but modern works like Mary Beard’s SPQR or the relevant volumes of The Cambridge Ancient History will give you the context you need. The more you know, the better collector you’ll be—and the more rewarding the entire journey becomes.

Putting It All Together: A Veteran’s Checklist

Before I wrap up, let me give you a consolidated checklist that summarizes everything we’ve covered. Print this out, keep it by your computer, and review it every time you’re about to buy an ancient Roman coin:

1. Check the surfaces: Is the patina natural and undisturbed? Has the coin been cleaned, tooled, or otherwise altered? If you can’t tell, consult an expert before buying.
2. Research the price: Is this coin fairly priced relative to its rarity and condition? Have you checked recent auction results and dealer price lists? Are you paying a “Twelve Caesars premium” that isn’t justified by the coin’s actual scarcity?
3. Verify the attribution: Is the coin correctly identified? Does the portrait, legend, and style match the purported ruler and issue? Is there a reliable provenance?
4. Resist the urge: Are you buying this coin because it’s a good value, or because you’re excited to fill a slot in your collection? Wait 48 hours before making any purchase over $200.
5. Learn the story: Do you understand why this coin is historically significant? Can you explain its context to someone else? If not, do more research before you buy.

Conclusion: The Enduring Value of the Twelve Caesars Collection

Lordmarcovan’s Twelve Caesars collection, assembled and sold in Fall 2025 for $16,000, represents far more than its price tag. It represents the culmination of a collecting journey that began with a $500-per-coin budget and evolved into a museum-quality set featuring a lifetime-issue Julius Caesar denarius, an Ephesus-mint Augustus cistophorus, the iconic Tiberius Tribute Penny, a Nero aureus, the impossibly scarce Galba, Otho, and Vitellius denarii from the turbulent Year of the Four Emperors, and the magnificent Titus elephant aureus commemorating the Colosseum’s grand opening.

The historical importance of such a collection cannot be overstated. These twelve rulers span the critical transition from Roman Republic to Roman Empire, from the assassination of Julius Caesar in 44 BC to the consolidation of Flavian power under Vespasian, Titus, and Domitian. The coins are primary sources—contemporary documents in metal—that tell us about propaganda, economics, art, religion, and power in the ancient world.

For the collector, the lesson is clear: the Twelve Caesars theme is one of the most rewarding pursuits in all of numismatics, but it demands knowledge, patience, and discipline. Avoid the five mistakes we’ve discussed—buying cleaned coins, overpaying for common dates, trusting bad holders, falling for marketing hype, and ignoring historical context—and you’ll build a collection that’s not only financially sound but genuinely meaningful.

As lordmarcovan himself might say: enjoy the journey. Build the set. Learn the history. And when the time comes to pass it on to the next collector, do it with the same care and intentionality that went into assembling it. That’s what this hobby is all about.

Numismatic regards to all fellow collectors. May your surfaces be original, your prices fair, and your history well-read.

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