Interregnum (1649–1660) in the context of "Ludlow Castle"

The Union of the Crowns (Scottish Gaelic: Aonadh nan Crùintean; Scots: Union o the Crouns) was the accession of James VI of Scotland to the thrones of England and Ireland as James I on 24 March 1603, and the consequent formation of a personal union between the Kingdoms of England, Scotland, and Ireland. It followed the death of James's cousin, Elizabeth I of England, the last monarch of the Tudor dynasty.

England, Scotland, and Ireland remained separate states with separate parliaments until the Acts of Union of 1707 united England and Scotland into a unitary Kingdom of Great Britain; Ireland retained a legally separate Crown and Parliament, albeit as a practical dependency, until 1801. However, there was a republican interregnum in the 1650s, during which the Tender of Union of Oliver Cromwell created the Commonwealth of England and Scotland, which ended with the Stuart Restoration.

The Commonwealth of England, enlarged in 1653 as the Commonwealth of England, Scotland and Ireland, was the political structure during the period from 1649 to 1660 when the Kingdom of England was dissolved into a republic after the end of the Second English Civil War and the trial and execution of Charles I. The republic's existence was declared through "An Act declaring England to be a Commonwealth", adopted by the Rump Parliament on 19 May 1649. Power in the early Commonwealth was vested primarily in the Parliament and a Council of State. During the period, fighting continued, particularly in Ireland and Scotland, between the parliamentary forces and those opposed to them, in the Cromwellian conquest of Ireland and the Anglo-Scottish war of 1650–1652.

In 1653, after dissolution of the Rump Parliament, the Army Council adopted the Instrument of Government, by which Oliver Cromwell was made Lord Protector of a united "Commonwealth of England, Scotland and Ireland", inaugurating the period now usually known as the Protectorate. After Cromwell's death, and following a brief period of rule under his son, Richard Cromwell, the Protectorate Parliament was dissolved in 1659 and the Rump Parliament recalled, starting a process that led to the restoration of the monarchy in 1660. The term Commonwealth is sometimes used for the whole of 1649 to 1660 – called by some the Interregnum – although for other historians, the use of the term is limited to the years prior to Cromwell's formal assumption of power in 1653.

The Stuart period of British history lasted from 1603 to 1714 during the dynasty of the House of Stuart. The period was plagued by internal and religious strife, and a large-scale civil war which resulted in the execution of King Charles I in 1649. The Interregnum, largely under the control of Oliver Cromwell, is included here for continuity, even though the Stuarts were in exile. The Cromwell regime collapsed and Charles II had very wide support for his taking of the throne in 1660. His brother James II was overthrown in 1689 in the Glorious Revolution. He was replaced by his Protestant daughter Mary II and her Dutch husband William III. Mary's sister Anne was the last of the line. For the next half century James II and his son James Francis Edward Stuart and grandson Charles Edward Stuart claimed that they were the true Stuart kings, but they were in exile and their attempts to return with German aid were defeated. The period ended with the death of Queen Anne and the accession of King George I from the German House of Hanover.

Recusancy (from Latin: recusare, lit. 'to refuse') was the state of those who remained loyal to the Catholic Church and refused to attend Church of England services after the English Reformation.

The 1558 Recusancy Acts passed in the reign of Elizabeth I, and temporarily repealed in the Interregnum (1649–1660), remained on the statute books until 1888. They imposed punishments such as fines, property confiscation and imprisonment on recusants. The suspension under Oliver Cromwell was mainly intended to give relief to Nonconformist Protestants rather than to Catholics, to whom some restrictions applied into the 1920s, through the Act of Settlement 1701, despite the 1828–1829 Catholic emancipation.