03/09/2026
Picture a medieval village in the year 1350. Everyone knows everyone. The blacksmith's daughter marries the miller's son. Completely normal, right?
Except the blacksmith and the miller? Their grandmothers were sisters. Nobody remembers this. Nobody keeps records going back that far. But genetically, mathematically, it happened.
Now multiply that scenario across centuries. Across thousands of villages. Across entire continents.
Here's what should happen when you trace your family tree backward: You have 2 parents. They had 4 parents combined. Those 4 had 8 parents. The numbers double every generation, climbing exponentially into the past.
Go back eleven generations, around 300 years, and you should have 4,094 direct ancestors. Go back to the year 1400, and the math says you'd have over one million ancestors. Push back to 1100, and you'd need over one billion people in your family tree.
But here's the problem. There weren't one billion people alive in 1100. Not even close.
The math breaks. And when the math breaks, something fascinating reveals itself.
What's actually happening is called pedigree collapse. The same person appears in your family tree dozens, hundreds, maybe thousands of times. Your ancestors weren't marrying strangers from across the world. They were marrying neighbors, people from nearby villages, often distant cousins they didn't even know were related.
This wasn't scandalous. It was inevitable. Most humans lived in isolated communities of a few hundred people. Travel was rare and dangerous. You married locally or you didn't marry at all.
So instead of 4,094 unique ancestors eleven generations back, you probably have between 500 and 1,000 actual individuals. Still significant. But a fraction of what simple multiplication suggests.
And here's where it gets profound: If you're of European descent and you go back to around the year 1000, you're not descended from a select few Europeans. You're descended from nearly every European alive then who left descendants.
Every single one. The kings and the beggars. The knights and the peasants. The merchants and the farmers. If they lived around 1000 CE and have living descendants today, they're your ancestor. Multiple times over.
We're not distant relatives. We're practically siblings, separated by a few centuries.