The Protectorate, officially the Commonwealth of England, Scotland and Ireland, is the period from 16 December 1653 to 25 May 1659 during which England, Wales, Scotland, Ireland and associated territories were joined together in the Commonwealth of England, governed by a Lord Protector. It began when Barebone's Parliament was dismissed, and the Instrument of Government appointed Oliver Cromwell Lord Protector of the Commonwealth. Cromwell died in September 1658 and was succeeded by his son Richard Cromwell.
Richard resigned in May 1659 due to his inability to control either the Army or Parliament. He was replaced by the English Committee of Safety, which dissolved the Third Protectorate Parliament, and reseated the so-called Rump Parliament dismissed by Cromwell in April 1653. This marked the end of the Protectorate, with the Rump acting as the legislature and the English Council of State as the executive.
Background
Since 1649 until the Protectorate, England, Ireland and later Scotland had been governed as a republic by the Council of State and the Rump Parliament. The Act declaring England to be a Commonwealth, which established England, together with "all the Dominions and Territoryes thereunto belonging", as a republic, had been passed on 19 May 1649, following the trial and execution of Charles I in January of that year. All of Ireland came under the same governance after the successful Cromwellian conquest of Ireland with the appointment of a Parliamentary military governor in Dublin. Scotland was invaded, subjugated and placed under an English military governor, who had been first appointed in 1651.
The process of placing the governance of Scotland on a more long-term constitutional footing began shortly after the defeat of the Scottish Royalists and Charles II at the Battle of Worcester. On 28 October 1651, the English Rump Parliament passed a declaration for union of the English and Scottish parliaments, but the process was not completed until an Act of Union was passed on 26 June 1657 (see Tender of Union).
On 20 April 1653, after learning that Parliament was attempting to stay in session despite an agreement to dissolve and having failed to come up with a working constitution, Cromwell, with the backing of the Grandees in the Army Council, marched soldiers into the debating chamber and forcibly ended the Rump's session.
Within a month of the Rump's dismissal, Oliver Cromwell, on the advice of Thomas Harrison and with the support of other officers in the Army, sent a request to Congregational churches in every county to nominate those they considered fit to take part in the new government. On 4 July a Nominated Assembly, nicknamed the "Assembly of Saints" or Barebone's Parliament after one of its members, took on the role of more traditional English Parliaments. However, it proved just as difficult for the Grandees to control and was in addition a subject of popular ridicule and so on 8 December, MPs who supported Cromwell engineered its end by passing a dissolution motion at a time of day at which the house usually had few members in attendance. Those who refused to recognise the motion were forcibly ejected by soldiers.
The collapse of the radical consensus that had spawned the Nominated Assembly led to the Grandees passing the Instrument of Government in the Council of State, which paved the way for the Protectorate.
Rule of Oliver Cromwell
After the dissolution of Barebone's Parliament, John Lambert put forward a new constitution known as the Instrument of Government, closely modelled on the Heads of Proposals. It made Cromwell Lord Protector for life to undertake "the chief magistracy and the administration of government". He had the power to call and dissolve parliaments but was obliged under the Instrument to seek the majority vote of the Council of State. However, Cromwell's power was also buttressed by his continuing popularity among the army, which he had built up during the civil wars and subsequently prudently guarded. Cromwell was sworn in as Lord Protector on 16 December 1653.