USS Siva (NCC-520) was a Saladin-class destroyer — lead ship of the Siva-subclass — on active duty in Starfleet during the 23rd century. (Star Fleet Technical Manual) A refit would include upgrades that made Siva the prototype for the Siva-class destroyers. (Starfleet Prototypes) Siva was destroyed in 2285 during the initial invasion of the Kelvan armada. (Orion Press: In Harm's Way)