Execution of Charles I in the context of "Whitehall"

Regicide is the purposeful killing of a monarch and is often associated a violent change in the regime, as in a revolution. A regicide can also be the person responsible for the killing. The word comes from the Latin roots of regis and cida (cidium), meaning "of monarch" and "killer" respectively.In the British tradition, it refers to the judicial execution of a king after a trial, reflecting the historical precedent of the trial and execution of Charles I of England. The concept of regicide has also been explored in media and the arts through pieces like Macbeth (Macbeth's killing of King Duncan).

Scholars have found that regicide is particularly common in political systems with unclear succession rules.

The Stuart Restoration was the reinstatement in May 1660 of the Stuart monarchy in England, Scotland, and Ireland. It replaced the Commonwealth of England, established in January 1649 after the execution of Charles I, with his son Charles II. The Commonwealth of England had been governed by Lord Protector Oliver Cromwell and then his son Richard Cromwell.

The term is also used to describe the reign of Charles II (1660–1685), and sometimes that of his younger brother James II (1685–1688).

Charles I (19 November 1600 – 30 January 1649) was King of England, Scotland, and Ireland from 27 March 1625 until his execution in 1649.

Charles was born into the House of Stuart as the second son of King James VI of Scotland. After his father inherited the English throne in 1603, he moved to England, where he spent much of the rest of his life. He became heir apparent to the kingdoms of England, Scotland, and Ireland in 1612 upon the death of his elder brother, Henry Frederick, Prince of Wales. An unsuccessful and unpopular attempt to marry him to Infanta Maria Anna of Spain culminated in an eight-month visit to Spain in 1623 that demonstrated the futility of the marriage negotiation. Two years later, shortly after his accession, he married Henrietta Maria of France.

Henrietta Maria of France (French: Henriette Marie; 25 November 1609 – 10 September 1669) was Queen of England, Scotland and Ireland from her marriage to King Charles I on 13 June 1625 until his execution on 30 January 1649. She was the mother of Charles II and James II and VII. Under a decree of her husband, she was known in England as Queen Mary, but she did not like this name and signed her letters "Henriette" or "Henriette Marie".

Henrietta Maria's Roman Catholicism made her unpopular in England, and also prohibited her from being crowned in a Church of England service; therefore, she never had a coronation. She immersed herself in national affairs as civil war loomed, and in 1644, following the birth of her youngest daughter, Henrietta, during the height of the First English Civil War, was compelled to seek refuge in France. The execution of Charles I in 1649 left her impoverished. She settled in Paris and returned to England after the Restoration of Charles II to the throne. In 1665, she moved back to Paris, where she died four years later.

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.

Oliver Cromwell (25 April 1599 – 3 September 1658) was an English statesman, politician and soldier, widely regarded as one of the most important figures in British history. He came to prominence during the Wars of the Three Kingdoms, initially as a senior commander in the Parliamentarian army and latterly as a politician. A leading advocate of the execution of Charles I in January 1649, which led to the establishment of the Commonwealth of England, Cromwell ruled as Lord Protector from December 1653 until his death.

Although elected Member of Parliament (MP) for Huntingdon in 1628, much of Cromwell's life prior to 1640 was marked by financial and personal failure. He briefly contemplated emigration to New England, but became a religious Independent in the 1630s and thereafter believed his successes were the result of divine providence. In 1640 he was returned as MP for Cambridge in the Short and Long Parliaments. He joined the Parliamentarian army when the First English Civil War began in August 1642 and quickly demonstrated his military abilities. In 1645 he was appointed commander of the New Model Army cavalry under Thomas Fairfax, and played a key role in winning the English Civil War.

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.