Although Vishnu was a Vedic solar deity, he is mentioned less often compared to Agni, Indra and other Vedic deities, thereby suggesting that he had a minor position in the Vedic religion. Other scholars state that there are other Vedic deities, such as water deity Nara (also mentioned as Narayana-Purusha in the Brahmanas layer of the Vedas), who together form the historical roots of Vaishnavism. In the late-Vedic texts (~1000 to 500 BCE), the concept of a metaphysical Brahman grows in prominence, and the Vaishnavism tradition considered Vishnu to be identical to Brahman, just like Shaivism and Shaktism consider Shiva and Devi to be Brahman respectively.