Edward Sexby was born in Suffolk in 1616. On the outbreak of the Civil War Sexby joined the Roundheads and by 1643 was a member of the regiment led by Oliver Cromwell. A supporter of the Levellers Sexby demanded the immediate establishment of male suffrage and opposed any attempt to reach a compromise with Charles I.
Sexby was one of those soldiers involved in the Putney Debates. In 1646 Leveller supporters were elected from each regiment of the army to participate in the Putney Debates that began at the Church of St. Mary on 28th October, 1647. The debate was based on An Agreement of the People, a constitutional proposal drafted by the Levellers. Thomas Rainsborough, the MP for Droitwich, argued: "I desire that those that had engaged in it should speak, for really I think that the poorest he that is in England hath a life to live as the greatest he; and therefore truly. Sir, I think it's clear that every man that is to live under a Government ought first by his own consent to put himself under that Government; and I do think that the poorest man in England is not at all bound in a strict sense to that Government that he hath not had a voice to put himself under; and I am confident that when I have heard the reasons against it, something will be said to answer those reasons, in so much that I should doubt whether he was an Englishman or no that should doubt of these things."
Sexby supported the ideas of Rainsborough: "We have engaged in this kingdom and ventured our lives, and it was all for this: to recover our birthrights and privileges as Englishmen - and by the arguments urged there is none. There are many thousands of us soldiers that have ventured our lives; we have had little property in this kingdom as to our estates, yet we had a birthright. But it seems now except a man hath a fixed estate in this kingdom, he hath no right in this kingdom. I wonder we were so much deceived. If we had not a right to the kingdom, we were mere mercenary soldiers. There are many in my condition, that have as good a condition, it may be little estate they have at present, and yet they have as much a right as those two (Cromwell and Ireton) who are their lawgivers, as any in this place. I shall tell you in a word my resolution. I am resolved to give my birthright to none. Whatsoever may come in the way, and be thought, I will give it to none. I think the poor and meaner of this kingdom (I speak as in that relation in which we are) have been the means of the preservation of this kingdom."
These ideas were opposed by officers in the New Model Army. One of them, Henry Ireton, argued: "First, the thing itself (universal suffrage) were dangerous if it were settled to destroy property. But I say that the principle that leads to this is destructive to property; for by the same reason that you will alter this Constitution merely that there's a greater Constitution by nature - by the same reason, by the law of nature, there is a greater liberty to the use of other men's goods which that property bars you." A compromise was eventually agreed that the vote would be granted to all men except alms-takers and servants.
A compromise was eventually agreed that the vote would be granted to all men except alms-takers and servants and the Putney Debates came to an end on 8th November, 1647. The agreement was never put before the House of Commons. Leaders of the Leveller movement, including John Lilburne and John Wildman, were arrested and their pamphlets were burnt in public. Oliver Cromwell is reported to have said: "What is the purport of the levelling principle but to make the tenant as liberal a fortune as the landlord. I was by birth a gentleman. You must cut these people in pieces or they will cut you in pieces."
Despite his radical political views Sexby became Governor of Portland in 1649. The following year he was promoted to the rank of lieutenant-colonel and commanded an infantry regiment in Scotland. He also raised an infantry regiment for service in Ireland.
In February 1651 Colonel Sexby took part in the siege of Tantallon Castle. A few months later he was sent as an agitator to France. He distributed a French translation of The Agreement of the People and worked closely with republicans living in Bordeaux. Sexby returned to England in August 1653.
Sexby grew disillusioned with the dictatorial policies of Oliver Cromwell and in 1655 joined John Wildman and Richard Overton in developing a plot to overthrow the government. The conspiracy was discovered and Sexby fled to Amsterdam.
In May 1657 Sexby published, under the pseudonym William Allen, Killing No Murder, a pamphlet that attempted to justify the assassination of Oliver Cromwell. The following month he arrived in England to carry out the deed, however, he was arrested on 24th July.
Edward Sexby died in the Tower of London on 13th January 1658.