Lord Krishna appeared in Navadvipa as Lord Chaitanya, and Balarama appeared with Him as Lord Nityananda. Nityananda Prabhu is the original Sankarshana and His expansions as the puruhshas in the universes are plenary expansions of Nityananda Prabhu. The place where Nityananda Prabhu appeared is called Garbhavasa. He was born in the village of Ekachakra, in the district of Birbhum, as the son of Padmavati and Hadai Pandita. Sri Nityananda Prabhu appeared in the sixteenth century.
There is no difference between the spiritual positions of Lord Chaitanya Mahaprabhu and Nityananda Prabhu, or Krishna and Balarama. All of Them are but different manifestations of the Supreme Personality of Godhead. Sri Chaitanya Charitamrita says, vrajendra-nandana yei, saci-suta haila sei, Balarama haila itai – Lord Krishna descended as Sri Chaitanya, the son of Mother Sachi and Lord Balarama appeared as Nityananda. He was instrumental in spreading the holy name of Krishna.
ISKCON temples all over the world on Nityananda Trayodashi, celebrate His appearance by performing panchamrita (milk, cuds, ghee, sweetened water and honey) abhisheka