Chaitanya Mahaprabhu
"Achintya Bheda Abheda" (Vaishnava), founded by Chaitanya Mahaprabhu (1486–1534 CE), was propagated by Gaudiya Vaishnava. Historically, it was Chaitanya Mahaprabhu who founded congregational chanting of holy names of Krishna in the early 16th century after becoming a sannyasi.