Rāghavēndra Swami or Rāghavēndra Tirtha, (c.1595–c.1671) was a Dvaita scholar, grammarian and the pontiff of the Madhvacharya Mutt at Kumbakonam from 1624 to 1671, His gentle nature and humanism is brought out through devotional poems composed in his honour by Gopala Dasa, (1721–1769) was a prominent 18th-century Kannada language poet, and saint, belonging to which tradition?