During the reign of
Tibet's king
Trisong Detsen in the 8th century, the Gyalrong area was visited by the great translator
Vairotsana. In 1410
Je Tsongkhapa's student Tshakho Ngawang Tapa established the first
Tibetan Buddhist Gelug school monastery in the area, called "Gyalrong". In contemporary history, most of Ngawa was under the 16th Administrative Prefecture of Szechwan (), which was established by the
Republic of China (ROC). The People's Republic of China defeated ROC troops in this area during Chinese Civil war and subsequently established a Tibetan autonomous prefecture by late 1952. It was renamed Aba Tibetan Autonomous Prefecture in 1956 and Aba Tibetan and Qiang Autonomous Prefecture in 1987. On May 12, 2008, a
major earthquake occurred in
Wenchuan County (), a county in the southeastern part of this autonomous prefecture. 20,258 people were killed, 45,079 injured, 7,696 missing in the prefecture as of June 6, 2008. ==Geography==