USS Jenghiz (NCC-501) was a Saladin-class destroyer on active duty in Starfleet during at least the 23rd century. (Star Fleet Technical Manual) In the 2270s, a refit would include upgrades (including linear warp drive) that would make Jenghiz the prototype for the Jenghiz-class destroyers. (Jackill's Starfleet Reference Manual: Ships of the Fleet, vol. 1, 2006 revision)