Tiantai

thumb|300px|Mount Tiantai by Wu Bin, 1605, Honolulu Museum of Art

Tiantai or '''T'ien-t'ai' () is an East Asian Buddhist school of Mahāyāna Buddhism that developed in 6th-century China. Drawing from earlier Mahāyāna sources such as Madhyamaka, founded by Nāgārjuna, who is traditionally regarded as the first patriarch of the school, Tiantai Buddhism emphasizes the "One Vehicle" () doctrine derived from the influential Lotus Sūtra, as well as the philosophy of its fourth patriarch, Zhiyi (538–597 CE), the principal founder of the tradition. Brook Ziporyn, professor of ancient and medieval Chinese religion and philosophy, states that Tiantai Buddhism is "the earliest attempt at a thoroughgoing Sinitic reworking of the Indian Buddhist tradition." According to Paul Swanson, scholar of Buddhist studies, Tiantai Buddhism grew to become "one of the most influential Buddhist traditions in China and Japan."