According to the good folk at Wikipedia in was today, the 30th of July in the year 762 that the Caliph Al-Mansur commissioned the construction of a new capital.
It would become one of the great world cities.
It certainly has weathered it all, war, famine, disease, greatness, decline, resurgence.
So, happy one thousand, two hundred, and fifty-sixth birthday, Baghdad! May there be many more…