For more than 1000 years, India was a trading powerhouse across the globe - not only of spices, wild animals and gemstones but also of language, philosophy, religion, mathematics and astronomy. But why is this part of India's history not so well known, and why did its dominance wane about 1200 AD?

Guest: William Dalrymple, historian, podcaster and author of The Golden Road How Ancient India Transformed the World (Bloomsbury)

For information about WIlliam Dalrymple's tour to Australia in October please click here.