Sir Arthur Haselrig, 2nd Baronet was a leader of the Parliamentary opposition to Charles I and one of the Five Members whose attempted arrest sparked the 1642–1646 First English Civil War. He held various military and political posts during the 1639–1651 Wars of the Three Kingdoms but became an opponent of Oliver Cromwell during the Protectorate. In 1660, his actions inadvertently helped restore Charles II to the throne; unlike many senior Parliamentary leaders, his life was spared but he was confined to the Tower of London, where he died on 7 January 1661.

The Five Members were Members of Parliament whom King Charles I attempted to arrest on 4 January 1642. King Charles I entered the English House of Commons, accompanied by armed soldiers, during a sitting of the Long Parliament, although the Five Members were no longer in the House at the time. The Five Members were:John Hampden Arthur Haselrig (1601–1661) Denzil Holles (1599–1680) John Pym (1584–1643) William Strode (1598–1645)