1911 Encyclopædia Britannica, Volume 18… (1911)
“ As Lady Mary was then in her sixty-third year, the scandalous interpretation put on the matter by Horace Walpole may safely be discarded. Her husband spent his last years in hoarding money, and at his death in 1761 is said to have been a millionaire. His extreme parsimony is satirized in Pope’s Imitations of Horace (2nd satire of the 2nd book) in the portrait of Avidieu and his wife. Her daughter Mary, countess of Bute, whose husband was now prime minister, begged her to return to England. She came to London, and died in the year of her return, on the 21st of August 1762. ”
