Hyrulean Civil War

The refers to the war that occurred prior to the events of Ocarina of Time. Little is known about this conflict, apart from the fact that it lasted for very long.

The War
The war was first referenced by the Great Deku Tree Sprout to explain Link's origins after he lifted the curse on the Forest Temple. To escape from the fires of the war, a Hylian mother and her baby boy went to the Kokiri Forest. Before passing away, the mother left her child under the guardianship of the Great Deku Tree. The child was raised as a Kokiri and a few years later became the Hero of Time.

Finally the war ended and resulted in the unification of Hyrule under one banner. Ganondorf once again swore fealty to the King of Hyrule. The peace was short lived however, as some years later, Ganondorf acquired the Triforce of Power and the conquest of Hyrule began.

Theories

 * It is possible that the war may have been fought over the Triforce and the entrance to the Sacred Realm. The conflicts described in the opening of A Link to the Past seem to also describe the war that broke out before Ocarina of Time.
 * In Twilight Princess, it is stated that the ancestors of the Twili tried to invade the Sacred Realm, and as such, their actions might have been what triggered the civil war. This would mean that the Interloper War was the same conflict as the Civil War.