Stormbird class

The Stormbird-class (or D7 class) battle cruiser was a type of warship designed and built by the Klingon Empire during the mid 23rd century. Following the formation of a Klingon-Romulan alliance in the 2260s, many D7s entered service in the Romulan Star Empire. (TOS episode: "The Enterprise Incident," FASA RPG: ''The Romulans: Star Fleet Intelligence Manual).