Pyotr Velikiy-class starships were Federation Starfleet vessels in service during the mid to late-23rd century. The class was considered a match for Klingon D-7-class starships in combat. It had at least four emergency transporter rooms. (VAN novella: The Ruins of Noble Men) The Pyotr Velikiy-class could be outfitted with a rollbar, somewhat like the Miranda-class. (TOS - Unlimited comic: "Action of the Tiger")