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Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader best known for his involvement in making England into a republican Commonwealth and for his later role as Lord Protector of England, Scotland and Ireland. He was one of the commanders of the New Model Army, which defeated 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, and ruled as Lord Protector from 1653 until his death in 1658.

Cromwell was born into the ranks of the middle gentry, and remained relatively obscure for his first forty years, slipping down to the level of yeoman farmer for a number of years in the 1630s before returning to the ranks of the gentry thanks to an inheritance from his uncle. A religious conversion experience during the same decade made an Independent style of Puritanism a core tenet of his life and actions. Cromwell was elected Member of Parliament (MP) for Cambridge in the Short (1640) and Long (1640-49) Parliaments, and later entered the English Civil War on the side of the "Roundheads" or Parliamentarians.

A brilliant soldier (nicknamed "Old Ironsides") he rose from leading a single cavalry troop to command of the entire army. Cromwell was the third person to sign Charles I's death warrant in 1649 and was an MP in the Rump Parliament (1649-1653), being chosen by the Rump to take command of the English campaign in Ireland during 1649-50. He then led a campaign against the Scottish army between 1650-51. On 20 April 1653 he dismissed the Rump Parliament by force, setting up a short-lived nominated assembly known as the Barebones Parliament before being made Lord Protector of England, Scotland, and Ireland on 16 December 1653 until his death. When the Royalists returned to power in 1660, his corpse was dug up, hung in chains, and beheaded.