D'Tan was a young Romulan male who resided on Romulus in the late 24th century.
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.n 2379, D'Tan was still an active member of the Romulan underground movement and was still a staunch defender of Ambassador Spock. When Tuvok went undercover on Romulus and entered the sewers where the movement maintained a base, he first encountered D'Tan who aimed a disruptor pistol at him until his identity was confirmed.