In the mid-17th century, Oliver Cromwell led Parliamentarian forces in a successful military campaign against the Royalists in the English Civil War. Cromwell captured and executed King Charles I in 1649. One faction of his Puritan coalition was known as the Levellers, a title initially applied by their detractors but one they themselves later embraced. The Levellers believed in the natural equality of all men in the political order (it appearing to have been beyond anyone's imagination at the time that women might have any political rights). “Universal manhood suffrage” was a key element of Leveller philosophy, which opposed limitation of the franchise to the propertied classes. As one of their leaders, a certain Colonel Rainsborough, famously put it in 1647, “Every man that is to live under a government ought first by his own consent to put himself under that government.”

The Levellers' concept was too radical. After Cromwell took power, he found the Leveller philosophy on suffrage more threatening to political stability than any of their other principles – including universal free speech – some of which would apparently influence the youthful U.S. government in the drafting of the Bill of Rights. Cromwell believed that their concept of universal manhood suffrage “pointed toward anarchy, [was an] attack on property, and [encouraged] mutiny in the army,” the latter because only soldiers believed they should have the right to vote. Cromwell's forces took up arms against the Levellers, they were repressed, and their leaders captured and shot (Cook 2006).