D'Tan was a young Romulan living on Romulus in 2368. D'Tan believed that Romulus would someday reunify with Vulcan. He was influenced by his parents, who taught him the Vulcan language. One of his favorite books was one that told the story of the Vulcan separation. D'Tan participated in underground efforts to bring Romulan society closer to this reunification. He was a friend of Ambassador Spock and a member of Spock's underground movement for Vulcan-Romulan reunification. (TNG: "Unification II" )