1720 – Upon birth he was known as the Lord Cavendish of Hardwic.
1729 – Became the Marquess of Hartington.
1731 – Married to Lady Charlotte Elizabeth Boyle, Baroness Clifford, the daughter and heiress of the 3rd Earl of Burlington of the 1st creation, a famous architect and art collector.
1751 – Was The Rt. Hon. Marquess of Hartington.
1755 – Was appointed as the Lord Lieutenant of Ireland and The Duke of Devonshire, PC.
1756 – Became the Prime Minister of Great Britain.
1764 – Died on October 2nd in Spa, Belgium.