T’ien-t’ai, Mount ［天台山］ (PY Tiantai-shan;  Tendai-san): A mountain in Chekiang Province in China where the Great Teacher T’ien-t’ai lived and where the T’ien-t’ai school was based. Both the name of the school and of its founder derive from this mountain. Mount T’ien-t’ai prospered as a center of Chinese Buddhism, and a number of temples were built there. It also had a significant influence on the development of Buddhism in Japan; the majority of priests from Japan who traveled to China to further their Buddhist learning studied at Mount T’ien-t’ai.