Banerjee too considered that they may have been semi-deified legendary kings who came to be considered as Vishnu's avatars. This would lead to an early form of Vaishnavism, currently described as the Pancaratra system. Also according to Gavin Flood - an Indologist and scholar of Hinduism, Vāsudeva may have originated in a real Vrishni hero or king, but the lineage is difficult to establish. This Vasudeva became deified in the Vrishni clan, its worship being traceable to the 4th century text of Pāṇini, which mentions Vāsudevaka or a devotee of Vāsudeva. Vāsudeva then fused with Krishna of the Yadavas clan. Over time, Vāsudeva was identified with Krishna and Vishnu.