Major Indian Tantric Buddhist philosophers such as Buddhaguhya, Padmavajra (author of the "Guhyasiddhi"), Nagarjuna (7th-century disciple of Saraha), Indrabhuti (author of the "Jñānasiddhi"), Anangavajra, Dombiheruka, Durjayacandra, Ratnākaraśānti and Abhayakaragupta wrote tantric texts and commentaries systematizing the tradition. Others such as Vajrabodhi and Śubhakarasiṃha brought Tantra to Tang China (716 to 720), and tantric philosophy continued to be developed in Chinese and Japanese by thinkers such as Yi Xing and Kūkai. In Tibet, philosophers such as Sakya Pandita (1182-28 – 1251), Longchenpa (1308–1364) and Tsongkhapa (1357–1419) continued the tradition of Buddhist Tantric philosophy in Tibetan.