Sidhe War
Name given to the ongoing conflict between the four Faerie Courts. According to Iwan the Crow who related this information to Heddwyn ap Idris, this war has been raging for centuries, though it does seem to be finally beginning to near a conclusion. Despite the singular name, the Sidhe Wars are really two distinct conflicts: the Winter Court's attempt to absorb the Spring Court and the Summer Court's equivalent war against the Autumn Court.
Ironically, most of this war has been waged in Ireland and is only now spilling back into Prydain.