On Yuan Chwang's Travels in India, 629–645 A.D. v1.c14.s3.5

v1.c14.s3.5

In a champaka grove to the south-west of the capital was an old Asoka tope to mark the spot at which the Buddha once overcame his religious opponents (that is, in controversy). Beside it were a Buddha-hair-and-nail relic tope and an Exercise ground. Near the relic tope was an old monastery in which Deva P'usa composed the "Kuang-pai-lun" for the refutation of the Hīnayānists and the conquest of the Tirthikas.