Construction of Regulus was authorized by the Starfleet appropriation of stardate 5930. (TOS reference: Star Fleet Technical Manual) In 2268, five different alien races unsuccessfully trIed to seize control of the starship, but were each thwarted by the crew. One year later, in 2269, the Regulus was assigned to survey the Antares Rift, but took damage, and had to abandon her mission. (TOS video game: Judgment Rites) Ulysses Montaya served aboard this vessel at some point in his career. (TOS video game: Judgment Rites)