T'Sara Frost (Star Trek: Courageous)

William Thomas Riker was a Human male who served in Starfleet during the 24th century. He served as first officer of the USS Enterprise-D and USS Enterprise-E, under the command of Captain Jean-Luc Picard, between 2364 and 2379. In in late 2379, he was promoted to captain and assigned command of the Luna-class explorer, USS Titan. (TNG: "Encounter at Farpoint"; Star Trek Nemesis)

Summary
At the same time as he took command of the Titan, Riker married his long-term lover Deanna Troi. She also joined the Titan as the ship's counselor and diplomatic officer. (Star Trek Nemesis; Star Trek: Titan: Taking Wing)

In 2385, Riker was cunningly promoted to admiral and tasked to investigate a fraught state of affairs within Starfleet after the death of Nanietta Bacco. (Star Trek: Titan: The Poisoned Chalice)