After a separation from a first husband in 1818 she married the Earl of Blessington; they traveled on the Continent, meeting Byron in 1822; her best-known work, Journal of Conversations with Lord Byron, originally appeared in the New Monthly Magazine (1832-33).

CORRESPONDENCE OF Marguerite Gardiner, countess of Blessington [née Power]:

Lord Byron to the Countess of Blessington, 3 May 1823 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)

Lord Byron to the Countess of Blessington, 6 May 1823 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)

Lord Byron to Countess of Blessington, 2 June 1823 in Letters and Journals of Lord Byron 2 Vols (London: John Murray, 1830)

Countess of Blessington to Peter George Patmore, [September? 1832] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, [December? 1832] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, [December? 1832] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, [December? 1832] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, 10 December 1832 in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, [10 September 1833?] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, 15 April [1837] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, 14 June 1844 in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, 6 July 1844 in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)

Countess of Blessington to Peter George Patmore, [February? 1845] in My Friends and Acquaintance: being Memorials, Mind-portraits, and Personal Recollections of Deceased Celebrities of the Nineteenth Century; with Selections from their Unpublished Letters 3 vols (London: Saunders and Otley, 1854)