Ada: Here's the strange part. The Round City itself faded long before the empire did. As Baghdad sprawled, the perfect circle became just the old core, and the Tigris slowly shifted its channel.
Theo: So the geometry that was the whole point just… dissolved into the sprawl.
Ada: Bit by bit. And then, in twelve fifty-eight, the Mongols came. Hulagu Khan, grandson of Genghis, laid siege and took the city.
Theo: And this is where the House of Wisdom—
Ada: Destroyed. The libraries were emptied into the Tigris. The chroniclers say the river ran black with ink from the books and red with blood. The last Abbasid caliph was executed, and the caliphate ended.
Theo: So the most perfectly planned city of its age — what's left of that original circle today?
Ada: Essentially nothing. No walls, no gates, no green dome. Scholars still argue over exactly where it stood. A city drawn in fire and horoscopes, and it vanished almost without a trace.
Theo: That's the haunting thing — such precision, such ambition, and now we can't even point to the spot.
Ada: Think back over the whole arc: two astrologers picking an auspicious hour, one hundred thousand hands raising a flawless ring of brick, then centuries of scholars who saved the ancient world's learning inside it.
Theo: And the lesson, maybe, is that no plan is permanent. You can measure a city with a compass and still not hold it against the river and the horsemen.
Ada: What survived wasn't the shape at all. It was the ideas — the algebra, the translations, the algorithms — that outlived every brick.
Theo: If you ever want to stop us and ask something — how those horoscopes worked, or where Hulagu went next — just jump in anytime.
Ada: This was Historai — where history answers back.