India was the forgotten heart of the ancient world.

For a millennium and a half, from about 250 BC to 1200 AD, India was a confident exporter of its diverse civilisation, creating around it a vast empire of ideas, an ‘Indosphere’ where its influence was predominant. During this period, the rest of Asia was the willing recipient of a mass-transfer of Indian soft power. Indian art, religions, technology, astronomy, music, dance, literature, mathematics, and mythology blazed a trail across the world, along a Golden Road that stretched from the Red Sea to the Pacific, connecting different places and ideas to one another.

Like ancient Greece, ancient India came up with a set of profound answers to the big questions about what the world is, how it operates, why we are here and ho