As time went by, Gondor neglected the watch on Mordor. There was a civil war, giving Umbar the opportunity to declare independence. The kings of Harad grew stronger, leading to fighting in the south. With a Great Plague the population began a steep decline. The capital was moved from Osgiliath to the less affected Minas Anor and evil creatures returned to the mountains bordering Mordor. There was war with the Wainriders, a confederation of Easterling tribes, and Gondor lost its line of kings. The Ringwraiths captured and occupied Minas Ithil which became Minas Morgul, "the Tower of Black Sorcery". At this time Minas Anor was renamed to Minas Tirith, in constant watch of its now defiled twin city.