The English Civil War (1642–1651), often referred to as The Civil War in Great Britain, was a series of armed conflicts and political machinations between Parliamentarians (Roundheads) and Royalists (Cavaliers). The first (1642–46) and second (1648–49) civil wars pitted the supporters of King Charles I against the supporters of the Long Parliament, while the third war (1649–51) saw fighting between supporters of King Charles II and supporters of the Rump Parliament. The Civil War ended with the Parliamentary victory at the Battle of Worcester on 3 September 1651.

The Civil War led to the trial and execution of Charles I, the exile of his son, Charles II, and replacement of English monarchy with, first, the Commonwealth of England (1649–53), and then with a Protectorate (1653–59), under Oliver Cromwell's personal rule. The monopoly of the Church of England on Christian worship in England ended with the victors consolidating the established Protestant Ascendancy in Ireland. Constitutionally, the wars established the precedent that an English monarch cannot govern without Parliament's consent, although this concept was legally established only with the Glorious Revolution later in the century.

A civil war is a war between organized groups within the same nation state or republic, or, less commonly, between two countries created from a formerly united nation state. The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies. The term is a calque of the Latin bellum civile which was used to refer to the various civil wars of the Roman Republic in the 1st century BC.

A civil war is a high-intensity conflict, often involving regular armed forces, that is sustained, organized and large-scale. Civil wars may result in large numbers of casualties and the consumption of significant resources.

Civil wars since the end of World War II have lasted on average just over four years, a dramatic rise from the one-and-a-half year average of the 1900-1944 period. While the rate of emergence of new civil wars has been relatively steady since the mid-19th century, the increasing length of those wars resulted in increasing numbers of wars ongoing at any one time. For example, there were no more than five civil wars underway simultaneously in the first half of the 20th century, while over 20 concurrent civil wars were occurring at the end of the Cold War, before a significant decrease as conflicts strongly associated with the superpower rivalry came to an end. Since 1945, civil wars have resulted in the deaths of over 25 million people, as well as the forced displacement of millions more. Civil wars have further resulted in economic collapse; Burma (Myanmar), Uganda and Angola are examples of nations that were considered to have promising futures before being engulfed in civil wars.

Oliver Cromwell (25 April 1599 – 3 September 1658) was an English military and political leader who was part of the joint republican, military and parliamentarian effort that overthrew the Stuart monarchy as a result of the English Civil War, and was subsequently invited by his fellow leaders to assume a head of state role in 1653. As such, Cromwell ruled as "Lord Protector" for a five-year segment (1653–58) of the 11-year period of republican Commonwealth and protectorate rule of England, and nominally of Ireland, Wales and Scotland. As one of the commanders of the New Model Army, he played an important role in the defeat of the King's forces, the royalists in the English Civil War. After the execution of King Charles I in 1649, Cromwell dominated the short-lived Commonwealth of England, conquered Ireland and Scotland, ruling as Lord Protector from 1653 until his death in 1658.

Cromwell was born into the ranks of the middle gentry, and remained relatively obscure for the first 40 years of his life. Along with his brother, Henry, he kept a small holding of chickens and sheep, selling eggs and wool to support himself. His lifestyle resembled that of a yeoman farmer until he received an inheritance from his uncle. After undergoing a religious conversion during the same decade, Cromwell made an independent style of puritanism an essential part of his life. He took a generally (but not completely) tolerant view towards the many Protestant sects of his period. As a ruler he executed an aggressive and effective foreign policy and did as much as any English leader to shape the future of the land he governed. But his Commonwealth collapsed after his death and the royal family was restored in 1660. An intensely religious man—a self-styled Puritan Moses — he fervently believed God was guiding his victories.