Mary Quin married Thomas Taylour (1757-1829) in 1778, becoming (in the Irish peerage) countess of Bective in 1795; the earl was created Marquis of Headfort in 1800.

REFERENCES TO Mary Taylour, marchioness of Headfort [née Quin]:

Lord Byron to Elizabeth Bridget Pigot, 11 August 1807 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)