The English Civil War (1642–1651) was a series of armed conflicts between Parliamentarians ("Roundheads") and Royalists ("Cavaliers") over the manner of England's governance. The first (1642–1646) and second (1648–1649) wars pitted the supporters of King Charles I against the supporters of the Long Parliament, while the third (1649–1651) saw fighting between supporters of King Charles II and supporters of the Rump Parliament. The war ended with the Parliamentarian victory at the Battle of Worcester on 3 September 1651.
The outcome was threefold: the trial and execution of Charles I (1649); the exile of his son, Charles II (1651); and the replacement of English monarchy with the Commonwealth of England (1649–1653) and then the Protectorate under the personal rule of Oliver Cromwell (1653–1658) and his son Richard (1658–1659). Constitutionally, the wars established that an English monarch cannot govern without Parliament's consent.