The Shahnameh (شاهنامه) of Ferdowsi, the National Epic of Persia, says all the best astronomers and savants of the world live in India. It also has 200+ references to the mighty Indian swords with golden scabbards, it seems Indian steel was the best in the civilized world.
The civilized world in the Shahnameh is talked of as India, Persia, China and Rum (Byzantine). Indian Physicians are described as the best, most skilled ones, with frequent references to Indian medicine books (which contain secret knowledge one must obtain).