The USS Theseus (NCC-552) was a 23rd century Federation starship, authorized on stardate 4699 by Starfleet for construction as a Mk VIIIb Saladin-class (Cochise-subclass) class I destroyer. (TOS reference: Star Fleet Technical Manual)
- The stardate given would seem to suggest this ship was ordered during the TOS era.
In 2266, the Theseus was assigned to the Taurus Reach to defend Starbase 47. (VAN novel: Open Secrets)
By 2268, the Theseus, along with the USS Akhiel and the USS Buenos Aires, had been reassigned from Starbase 47 by Starfleet Command to missons of equal or greater importance.