Tavin was a Vulcan captain in command of the Vahklas, a Vahklas-type ship. He was a member of the V'tosh ka'tur, a sect of Vulcan society that did not believe in repressing their emotions, but instead reintegrating them back into their psyche.
In 2151, he encountered the Earth starship Enterprise NX-01. Captain Archer invited him aboard for dinner and was amazed by Tavin's pleasant behavior. Tavin explained that he and his shipmates were on a quest to explore feelings and to balance emotions and logic. During dinner, they discussed this concept and enjoyed the food, even eating meat. He also requested Chef's recipe for chicken marsala. (ENT: "Fusion")