Nagar Purushottam was previously the cowherd named Daman in Vraja. He is now born in a Vaidya family as the son of Sadashiva. (Gaura-ganoddesha-dipika 131)
Daman was one of the twelve Gopals and a companion of Krishna in his childhood pastimes in Vraja. In the eleventh chapter of the Adi-lila of Chaitanya Charitamrita, Krishna Das Kaviraj Goswami has listed Purushottam Das amongst the Devotees of Lord Nityananda.