The main exponent of the Kumara or Chatuhsana sampradaya (this knowledge was transmitted to the four Kumaras by the Hamsa avatara), who lived in the 13th century and propagated the doctrine called dvaita advaita, “simultaneous oneness and duality”.
Shri Nimbarkacharya is believed to be the incarnation of the Sudarshana Chakra (the Discus weapon of Krishna)At the end of Treta Yuga, the Brahmanas, being afraid of the Asuras, prayed to Lord Hari. They also prayed to Brahma who himself prayed to Lord Hari again. Then the Lord summoned his own Sudarshana Chakra -a part of Himself- and commanded him to descend on earth to revive and teach the Vaishnava Dharma which was waning and which he could learn from Narada, and spread it all around.