In November 1827 Count D'Orsay
contracted an arranged marriage with Lord Blessington's legitimate daughter, the fifteen-year-old Lady Harriet Gardiner
. He thereby became Lord Blessington's legal heir.
Feldman, Paula R., editor. British Women Poets of the Romantic Era. John Hopkins University Press.
Matthew, Henry Colin Gray et al., editors. Oxford Dictionary of National Biography. http://www.oxforddnb.com/.