According to Rigopoulos, in the Nath tradition of Shaivism, Dattatreya is revered as the Adi-Guru (First Teacher) of the Adinath Sampradaya of the Nathas, the first Lord of Yoga with mastery of Tantra (techniques), although most traditions and scholars consider Adi Nath an epithet of Shiva. His pursuit of simple life, kindness to all, sharing of his knowledge and the meaning of life during his travels is reverentially mentioned in the poems by Tukaram, a saint-poet of the Bhakti movement. Over time, Dattatreya has inspired many monastic movements in Shaivism, Vaishnavism and Shaktism, particularly in the Deccan region of India, south India, Gujarat, Rajasthan and Himalayan regions where Shiva tradition has been strong. According to Mallinson, Dattatreya is not the traditional guru of the Nath Sampradaya, he was coopted by the Nath tradition in about the 18th century as a guru, as a part of Vishnu-Shiva syncretism. This is evidenced by the Marathi text Navanathabhaktisara, states Mallinson, wherein there is syncretic fusion of the Nath Sampradaya with the Mahanubhava sect by identifying nine Naths with nine Narayanas.