The Romulans are a fierce warrior race, and their ships reflect that. Just like the Klingons (they don't stink so much, however) the Romulan warships are very powerful and advanced. The main Romulan vessel, the D'Deridex class warbird (overhead) is an impressive starship. It has the length of two Sovereign-class vessels, has a cloaking device, and uses a artificial quantum singularity core for energy. Below is the lesser-known Romulan Bird of Prey, a vessel that had its initial testing suns in the latter half of the 23rd century. It had plasma weapons and was the first to use a cloaking device. The Romulan fleet also used Klingon D-7 cruisers taken during the brief alliance between the two empires.

The Romulan Bird of Prey

The Romulan D-7

The Romulan Scoutship