"The Modern Review, Volume 88," Ramananda Chatterjee, Prabasi Press Private, Limited, 1950, ... We have definite archaeological data, which tend to prove that once the ancient cities of Siam — like Phimai (Bhima- pura), Nakhon Pathom, Lopbun (Lava-puri) and Petchaburi (Vajra- puri, i.e., the 'City of Diamonds') — were great seats of Buddhist learning ...