The IKS Kretoq was a D7-class warship in service in the 2260s.
In 2267, the Kretoq was loaned to the Romulans by the Klingons so that they could install a cloaking device on the Kretoq and use it as a test bed before outfitting other Klingon vessels with cloaking devices. Later that year, Proconsul Toqel took the ship to Theta Cobrini V in order to attack the Federation outpost there, but the base was already destroyed when they got there. Then several Klingon warships decloaked and destroyed the other Romulan controlled ship, the IKS Vo'qha, and fired on the Kretoq. The Kretoq was then allowed to return to Romulan space after the engagement ended. (ST novella: The First Peer)