Dattatreya
In the Nath tradition, Dattatreya is seen as an Avatar or incarnation of the Lord Shiva and as the Adi-Guru (First Teacher) of the Adi-Nath sampradaya of the Nathas. Although Dattatreya was at first a "Lord of Yoga" with Tantric traits, he was adapted and assimilated into the more devotional cults; while still worshiped by millions of Hindus, he is approached more as a benevolent God than as a teacher of the highest essence of Indian thought.