"John Cecil, 6th Earl of Exeter (15 May 1674 – 24 December 1721), known as Lord Burghley from 1678 to 1700, was a British peer and Member of Parliament.
He was the son of John Cecil, 5th Earl of Exeter, and Anne Cavendish. He sat as Member of Parliament for Rutland from 1695 to 1700, when he succeeded his father in the earldom and entered the House of Lords. Between 1712 and 1715 he also served as Lord Lieutenant of Rutland.
Exeter married, firstly, Annabella Grey, daughter of Ford Grey, 1st Earl of Tankerville, in 1697. After her death in 1698 he married, secondly, Elizabeth Brownlow, daughter of Sir John Brownlow, 3rd Baronet, in 1699. He died in December 1721, and was succeeded in his titles by his eldest son from his second marriage, John. Lady Exeter died in 1723." - (en.wikipedia.org 12.08.2021)