> There were some premodern societies where land possession was very fluid.
Yes, commons, rotating field systems, and similar arrangements show that.
> But. There were plenty of others where land ownership worked almost exactly like today’s systems.
Not quite. Transactions existed, but they were embedded in systems of obligation and sovereignty — kings, emperors, or lords claimed ultimate rights. That’s a different structure from modern absolute private ownership.
> The oldest clay tablets talk about buying and selling land, systems of laws protecting land ownership, court cases involving land disputes, and surveyors laying out stone boundary markers that were meant to stay put for centuries.
Those records exist, but even in Mesopotamia rulers could reallocate or confiscate land. Ownership wasn’t as secure or absolute as a modern freehold title.
> Incan quipu cords were records of who owned which piece of land.
Quipus tracked obligations and allocations. Land under the Inca was held communally and redistributed, not privately owned.
> Asian rice terraces have been individually owned for thousands of years.
Some land was inherited and sold, but there were also systems of redistribution (for example, the Chinese equal-field system). That’s not the same as permanent, alienable freehold.
> This urban legend that private property is not an ancient concept is really wonky.
It’s not an urban legend. Property has always been a bundle of rights that varied across societies. The modern model of land as a freely tradable commodity giving the holder near-total monopoly is comparatively recent.