John Lilburne, also known as Freeborn John, was an English political Leveller before, during and after the English Civil Wars 1642–1650. He coined the term "freeborn rights", defining them as rights with which every human being is born, as opposed to rights bestowed by government or human law. In his early life he was a Puritan, though towards the end of his life he became a Quaker. His works have been cited in opinions by the United States Supreme Court.

The Levellers were a political movement active during the Wars of the Three Kingdoms who were committed to popular sovereignty, extended suffrage, equality before the law and religious tolerance. The hallmark of Leveller thought was its populism, as shown by its emphasis on equal natural rights, and their practice of reaching the public through pamphlets, petitions and vocal appeals to the crowd.