Tsongkhapa was a prominent Tibetan Buddhist scholar and teacher who lived in the 14th century. He is best known for founding the Gelug school of Tibetan Buddhism, which emphasizes monastic discipline and the study of Buddhist philosophy. His teachings focused on the importance of ethical conduct, meditation, and wisdom. Tsongkhapa is also recognized for his writings, including the influential text, the Great Treatise on the Stages of the Path to Enlightenment. His legacy continues to shape Tibetan Buddhism, and he is revered as a key figure in the development of Buddhist thought and practice in Tibet.