Marquess Wellesley is in Marquis and Marquess Ireland.
In 1799 Richard Wellesley 1st Marquess Wellesley [aged 38] was created 1st Marquess Wellesley. Hyacinthe Gabrielle Roland Marchioness Wellesley [aged 33] by marriage Marchioness Wellesley.
On 29th October 1825 Richard Wellesley 1st Marquess Wellesley [aged 65] and Marianne Caton Marchioness Wellesley [aged 37] were married. She by marriage Marchioness Wellesley. The difference in their ages was 27 years. He the son of Garrett Wellesley 1st Earl Mornington and Anne Hill Countess Mornington [aged 83].
She one of the four Caton sisters, daughters of Richard Caton [aged 62], a merchant from Baltimore, the three eldest, known as the "The Three American Graces", married European husbands. Only the fourth daughter Emily Caton [aged 30] had children.
Marianne Caton Marchioness Wellesley married Richard Wellesley 1st Marquess Wellesley,
Elizabeth Caton Baroness Stafford [aged 35] married George William Stafford-Jerningham 8th Baron Stafford [aged 54],
Louisa Catharine Caton Duchess Leeds [aged 32] married firstly Felton Elwell Hervey-Bathurst 1st Baronet and secondly Francis Godolphin Osborne 7th Duke Leeds [aged 27].
Emily Caton married Consul John MacTavish [aged 38].