Tsongkhapa Losang Drakpa (1357–1419), perhaps Tibet’s greatest religious genius, founded the Geluk school and Ganden Monastery and was teacher to the First Dalai Lama.Tsongkhapa Losang Drakpa (1357–1419), perhaps Tibet’s greatest religious genius, founded the Geluk school and Ganden Monastery and was teacher to the First Dalai Lama.