The challenge, he says, is that “Xuanzang’s text was written more than thirteen centuries ago. Over that time, languages evolved, locations vanished, and the geography of the subcontinent itself changed. His journey was recorded in units like the Chinese Li and the Indian Yojana, which are subjective and difficult to interpret. By the 19th century, Nalanda, Vaishali, Rishipattana, Sravasti, Kushinagar and many more places he described no longer existed in living memory. Buddhism had declined after political shifts, and sacred sites like Lumbini, Bodhgaya, Sarnath and Kusinagara were abandoned and fell into ruins. Many had even acquired new names—Vaishali became Kolhua, Sravasti became Sahet. Explorers such as Cunningham, John Marshall and R D Banerji eventually managed to identify many of these sites and piece together Xuanzang’s route.”