Cambridgeshire ( /ˈkeɪmbrɪdʒʃər/ or /ˈkeɪmbrɪdʒʃɪər/; also known, archaically, as the County of Cambridge; abbreviated Cambs.) is a county in England, bordering Lincolnshire to the north, Norfolk to the northeast, Suffolk to the east, Essex and Hertfordshire to the south, and Bedfordshire and Northamptonshire to the west. The principal settlement is the city of Cambridge. Modern Cambridgeshire was formed from the historic counties of Cambridgeshire and Huntingdonshire, together with the Isle of Ely and the Soke of Peterborough; it contains most of the region known as Silicon Fen.

Cambridgeshire is twinned with Kreis Viersen in Germany.

Cambridgeshire is noted as the site of some of the earliest known Neolithic permanent settlements in the United Kingdom, along with sites at Fengate and Balbridie.

Cambridgeshire was recorded in the Domesday Book as "Grantbridgeshire" (or rather Grentebrigescire) (cf the river Granta). Covering a large part of East Anglia, Cambridgeshire today is the result of several local government unifications. In 1888 when county councils were introduced, separate councils were set up, following the traditional division of Cambridgeshire, for

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.