Churchill was the son of Sir John Churchill of Dorset, a lawyer and politician, and his wife Sarah Winston, daughter of Sir Henry Winston. Churchill was educated at St John's College, Oxford, but he left university without taking a degree. The main reason for it was the beginning of the Civil War.
Churchill was a fervent Royalist throughout his life. He fought and was wounded in the Civil War as a captain in the King's Horse and, after the Royalists were defeated, was forced to pay a recompense fee of £446 (equivalent to around £44,600 in the present day).
Churchill was knighted in 1664 and made a Fellow of the Royal Society the same year. He also published a history of the kings of England, entitled Divi Britannici; being a remark upon the Lives of all the Kings of this Isle, from the year of the World 2855 until the year of Grace 1660 (1675). He died in March 1688, at the age of 67.
They had eleven children, seven sons and four daughters, of whom only six survived infancy. Of their sons, Mountjoy died in infancy, while Winston died at the Battle of Solebay in 1672, aged 20.[5][citation needed] Jasper attended Queen's College, Oxford,[6] and was commissioned in the Duke of York's Regiment in 1678,[7] but he appears to have died soon thereafter. Theobald also attended Queen's College, took holy orders, became chaplain in his brother's regiment (Churchill's Dragoons) in 1683, but he died in 1685 at age 22.[8]
For many years he was unfaithful to his wife and his maid Betty.
Arabella became mistress of James, Duke of York in about 1665. In 1667, on most accounts, James obtained a commission for John in the Guards and, in 1675, John was commissioned captain in the Duke of York and Albany's Maritime Regiment. Charles was commissioned Ensign (in 1674) and Captain (1679) in the Duke of York's Regiment. George although pursuing a mainly Admiralty career, was commissioned Ensign (1676) and Lieutenant (1678) in the Duke of York's Regiment. Jasper was commissioned ensign in 1678, in the Duke of York's Regiment. Theobald, the cleric, stood out: he was commissioned Chaplain in November 1683, but in the King's Own Royal Regiment of Dragoons commanded then by John, Lord Churchill. Fifteen months after that, James, Duke of York, was king.