The papers of the Fitzgerald family, Earls of Kildare and Leinster, of Maynooth Castle and Carton, County Kildare comprise of 28 volumes and c.1800 documents, 1250-1949. These records are also available on microfilm, MIC/541. A detailed calendar of this collection is available. This collection includes, for example:
Transcripts of family pedigrees, 17th century.

Letters to Emily, Countess and Marchioness of Kildare, later Duchess of Leinster and wife of the 1st Duke, from her eldest son, 1757-1760s.

Letters to the 2nd Duke, including several letters from the Dowager Duchess of Leinster, 1802-1803.

A letter from Lady Louisa Lennox to William Ogilvie, 1798.

Letters to Caroline, Duchess of Leinster, wife of the 4th Duke, 1880-1886.

Letters to 4th Duke of Leinster, including one from his cousin, Lady Pamela Campbell, enclosing two letters from Dowager Lady Kildare to her granddaughter, Lady Sophia Fitzgerald, 1778, 1779.

2 manuscript poems by Lady Hermione Duncombe, later wife of 5th Duke of Leinster, with letters to her, 1879-1897.

Album kept by Hermione Kildare and containing pictures of houses and signatures from house parties, 1884-1886.

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