Nimbarkacharya (Sanskrit: निम्बार्काचार्य, romanized: Nimbārkāchārya) (c. 1130 – c. 1200), also known as Nimbarka, Nimbaditya or Niyamananda, was a Hindu philosopher, theologian and the chief proponent of the theology of Dvaitadvaita (dvaita–advaita) or dualistic–non-dualistic. He played a major role in spreading the worship of the divine couple Radha and Krishna, and founded Nimbarka Sampradaya, one of four main traditions of Hindu sect Vaishnavism.