Mary Eleanor Bowes became Countess of Strathmore
when on her eighteenth birthday she married, at St George's, Hanover Square, in London, John Lyon, Earl of Strathmore
.
Cokayne, George Edward. The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant. Editor Gibbs, Vicary, St Catherine Press, 1910–1959, 14 vols.