Instrument of Government
Constitution
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The Instrument of Government was a constitution of the Commonwealth of England, Scotland and Ireland. Drafted by Major-General John Lambert in 1653, it was the first sovereign codified and written constitution in England. Wikipedia
Date effective: 16 December 1653; (Installation of the Lord Protector)
Executive: Lord Protector, Council of State
First legislature: 3 September 1654
Original title: The Government of the Commonwealth of England, Scotland and Ireland and the Dominions thereunto belonging
Repealed: 25 May 1657 (superseded by Humble Petition and Advice)