The Patroclus was a battlecruiser in service to the Dominion Fleet. After the Battle of Char, its crew sided with Valerian Mengsk in the conflict that broke out between his forces and those loyal to Arcturus Mengsk. As the battle progressed, the ship took damage, but responded to Valerian's order to meet at designated point of clear space within the Char system. However, Arcuturus's flagship was able to land a perfect hit on the Patroclus, crippling or disabling it. Either way, it was left behind when the rest of Valerian's fleet entered warp space.
Patroclus is a character from Greek mythology