Kin-strife

The Gondorian civil war.
The civil war that erupted in Gondor in the middle of the Third Age. Eldacar, the rightful heir of King Valacar, had been raised in a foreign country, and his right to the Kingship was therefore challenged by Castamir, who himself had some claim on the throne. Castamir succeeded in usurping the Kingship, but held it just ten years before Eldacar reclaimed it and restored order.