In an alternate reality in which the Cardassians discovered the Bajoran wormhole, the Grimar was a Romulan warbird in service to the Romulan Star Empire during the 24th century. It was commanded by Subcommander Lar.
In 2373, the Grimar entered Klingon territory and launched an unprovoked attack on No'Var Outpost, resulting in its own destruction. Chancellor Gowron used this incident as a justification to sanction violence and initiate war against the Romulan Star Empire. (ST - Myriad Universes novel: A Gutted World)