According to Richard Maxwell Eaton, author of A Social History of the Deccan, Vithoba was first worshiped as a pastoral god as early as the 6th century. Vithoba's arms-akimbo iconography is similar to Bir Kuar, the cattle-god of the Ahirs of Bihar, who is now also associated with Krishna. Vithoba was probably later assimilated into the Shaiva pantheon and identified with the god Shiva, like most other pastoral gods. This is backed by the facts that the temple at Pandharpur is surrounded by Shaiva temples (most notably of the devotee Pundalik himself), and that Vithoba is crowned with the Linga, symbol of Shiva. However, since the 13th century, the poet-saints like Namdev, Eknath and Tukaram identified Vithoba with Vishnu.