Three Sovereigns and Five Emperors
"Longma" means dragon-horse, or horse-dragon. Among other accounts, a longma was said to have revealed the Yellow River Map, an early example of a mathematical magic square. Indeed, the presence of a "longma" was used as a sign of connection with the manifestation of one of the legendary sage-rulers of legend, particularly one of the Three Sovereigns and Five Emperors. As described below, the monk Xuanzang, was legendarily held to have retrieved Buddhist scriptures from India with the help of a famous "bailongma", or "white dragon-horse". The "Baimasi", or "White Horse Temple" is a name in China for old and famous Buddhist temples.