The USS Valiant (NCC-1223) was a Lancaster-class Federation starship in the early 23rd century. Valiant was lost at Eminiar VII in 2217. (TOS: "A Taste of Armageddon", The Starfleet Museum) In the Orion Press continuity, Valiant is a Leonidas-class destroyer. According to the Ship Recognition Manual, Volume 4: Starships of the Original Series Era it was a Ranger-class explorer. Valiant's commanding officer in 2217 was Captain Soo Chi. (Orion Press: "Alia Volat Propriis", "Return to Xantharus", "Reminiscing")