Al Baruni was the author of the book "Kitab-ul-Hind".
Al-Biruni is regarded as one of the greatest scholars of the medieval Islamic era and was well versed in physics, mathematics, astronomy, and natural sciences, and also distinguished himself as a historian, chronologist and linguist.
kitab-ul-Hind is one of the earliest encyclopedias about South Asia and its people . Al Baruni even learn Sanskrit to write this book.
