A Romulan-Vulcan War, lasting a hundred years, was at one point waged between Romulans and Vulcans. According to Q, the war was ignited by a misunderstanding triggered by a "self destructive stunt" by Quinn. (VOY: "Death Wish")
The war was not named on-screen. It is unclear when exactly this war happened, and Q's account might even refer to the Time of Awakening.