In The Golden Road, William Dalrymple proposes that India had a role in shaping and reshaping the ancient and medieval world.

Narrator: In 762, the city of Baghdad was established by Al-Mansur. The centre was a perfect circle. The round city. By 814, Baghdad was the world's largest city with over one million inhabitants.

You made it! I’m Ali. I live here in Baghdad – a city of over a million people and the most advanced city in the world. We made the city completely round and we’ve put the important things ...