Sri Chaitanya Mahaprabhu was a 15th-century Indian saint who is considered to be the combined avatar of Radha and Krishna by his disciples and various scriptures. Chaitanya Mahaprabhu's mode of worshipping Krishna with ecstatic song and dance had a profound effect on Vaishnavism in Bengal. He was also the chief proponent of the Vedantic philosophy of Achintya Bheda Abheda Tattva. Mahaprabhu founded Gaudiya Vaishnavism (a.k.a. the Brahma-Madhva-Gaudiya Sampradaya). He expounded Bhakti yoga and popularized the chanting of the Hare Krishna Maha-mantra. He composed the Shikshashtakam (eight devotional prayers). Chaitanya is sometimes called Gauranga or Gaura due to his molten gold–like complexion. His birthday is celebrated as Gaura-purnima. He is also called Nimai due to him being born underneath a Neem tree.