In the 1760s William Blackstone described the Fundamental Laws of England in Commentaries on the Laws of England, Book the First – Chapter the First : Of the Absolute Rights of Individuals as "the absolute rights of every Englishman" and traced their basis and evolution as follows:
Blackstone's list was an 18th-century constitutional view, and the Union of the Crowns had occurred in 1603 between Kingdom of England and Kingdom of Scotland, and the 1628 Petition of Right had already referred to the fundamental laws being violated.
The phrase Fundamental Laws of England has often been used by those opposing particular legislative, royal or religious initiatives.
For example, in 1641 the House of Commons of England protested that the Roman Catholic Church was "... subverting the fundamental laws of England and Ireland....", part of a campaign ending in 1649 with the beheading of King Charles I.
Subsequently, the phrase was used by the Leveller Lieut. Col. John Lilburne (later to become a Quaker) accusing the House of Lords and House of Commons of tyranny in The Just Defence of John Lilburne, Against Such as charge him with Turbulency of Spirit. Lilburne also wrote a 1646 book called The Legal Fundamental Liberties of the People of England, asserted, revived and vindicated.
Also in 1646, the General Court of Massachusetts referred to the Fundamental Laws of England in regard to the Magna Carta, while defending their representative and legislative autonomy in their address to the Long Parliament.
In his 1670 trial, William Penn called upon the phrase many times, including "... However, this I leave upon your Consciences, who are of the Jury (and my sole Judges) that if these Ancient Fundamental Laws, which relate to Liberty and Property, and (are not limited to particular Persuasions in Matters of Religion) must not be indispensably maintained and observed, Who can say he hath Right to the Coat upon his Back? ...". The aftermath of the trial established Bushell's Case, preventing a jury from being fined for its verdict.