During the 17th century, Ireland was convulsed by eleven years of warfare, beginning with the Rebellion of 1641, when Irish Catholics rebelled against the domination of English and Protestant settlers. The Catholic gentry briefly ruled the country as Confederate Ireland (1642–1649) against the background of the Wars of the Three Kingdoms until Oliver Cromwell reconquered Ireland in 1649–1653 on behalf of the English Commonwealth. Cromwell's conquest was the most brutal phase of the war. By its close, around half of Ireland's pre-war population was killed or exiled as slaves, where many died due to harsh conditions. As retribution for the rebellion of 1641, the better-quality remaining lands owned by Irish Catholics were confiscated and given to British settlers. Several hundred remaining native landowners were transplanted to Connacht.