William Cavendish, 1st Duke of Devonshire
A wealthy, forceful Whig magnate who helped engineer the bloodless coup that permanently shifted power from the English crown to Parliament.
1640–1707 (age 67)·English politician·Birthday: January 25
Biography
William Cavendish was a political operator in an age when politics was a blood sport. Inheriting vast estates and the title Earl of Devonshire, he became a pillar of the emerging Whig faction, which championed parliamentary authority and Protestant succession. His true historical weight comes from a single, clandestine act: in 1688, he was one of the seven English nobles who signed the secret invitation urging William of Orange to invade England and depose the Catholic King James II. This was not mere dissent; it was treason, punishable by death. Cavendish backed his signature with action and money, raising troops for William's cause. The successful 'Glorious Revolution' that followed was remarkably bloodless and established a constitutional monarchy. As a reward, William III elevated him to Duke of Devonshire. The first Duke was no mere figurehead; he served as Lord Steward and used his fortune to begin building Chatsworth House into a palace worthy of his new dynasty's power, cementing the Cavendish family as one of England's most enduring political forces.
#1 When William Was Born
The biggest hits of 1640
William's Life & Times
The world at every milestone
1640Born
1645Started school
1653Became a teenager
1656Could drive
1658Could vote
1661Turned 21
1670Turned 30
1680Turned 40
1690Turned 50
1700Turned 60
1707Died at 67
Key Achievements
- Was a key signatory of the 'Immortal Seven' letter that invited William of Orange to take the English throne, triggering the Glorious Revolution.
- Was elevated from Earl to the first Duke of Devonshire in 1694 by King William III for his crucial support.
- Served as Lord Steward of the Household under King William and Queen Anne.
- Initiated the massive Baroque rebuilding of Chatsworth House, establishing it as the family's principal seat.
Did You Know?
He was fined a staggering £30,000 for scuffling with a fellow noble in the court of King Charles II.
His son and grandson both also served as Lord Steward, making the position almost a Cavendish family office for a time.
He was a patron of the philosopher Thomas Hobbes, who once worked as a tutor for the Cavendish family.
“The King must be opposed, for the law and the liberties of Parliament are paramount.”
