In 2276, the Sempach was one of six Starfleet ships that met with a Romulan flotilla for peace talks under the protection of the Lalairu city-ship Mascrar. The other Starfleet ships were the Constitution-class ships: USS Enterprise under Captain Kirk; USS Ortisei, under Captain Harold Gutierrez; the USS Hemalat under Caitian Captain Hressth ssha-Aurrjjesh; the USS Lake Champlain, under Centauri Captain Finn Winter; and the USS Nimrod. Also present was the renegade Romulan warbird ChR Bloodwing under former Commander-General Ael t'Rllaillieu, who had stolen the Sword of S'task from the Empty Chair in the Romulan Senate.