Mongolian Buddhism: Ogodei’s second son, Godan Khan (1206 – 1251), invaded Tibet several times and in 1244 brought 3 prominent Tibetan Sakya lamas as guests (or hostages) to his court in Liangzhou (modern Gansu province): They were Sakya Paṇḍita, 1182-1251), head of the Sakya School, and his 2 nephews. Buddhism - specifically Tibetan Buddhism - began to have a significant impact on Mongolian concepts of rulership and Empire.