Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader who was part of the joint republican, military and parliamentarian effort that overthrew the Stuart monarchy as a result of the English Civil War, and was subsequently invited by his fellow leaders to assume a head of state role in 1653. As such, Cromwell ruled as "Lord Protector" for a five-year segment (1653–58) of the 11-year period of republican Commonwealth and protectorate rule of England, and nominally of Ireland, Wales and Scotland. As one of the commanders of the New Model Army, he played an important role in the defeat of the King's forces, the royalists in the English Civil War. After the execution of King Charles I in 1649, Cromwell dominated the short-lived Commonwealth of England, conquered Ireland and Scotland, ruling as Lord Protector from 1653 until his death in 1658.