Thomas FitzMaurice, Lord OConnello, (c. 1145 – 1213) of Shanid,Webb, Alfred. A Compendium of Irish Biography. Dublin: 1878. was the eldest son of Maurice FitzGerald, Lord of Lanstephan by his wife, Alice (daughter of Arnulf de Montgomery).Weis, Frederick Lewis. Ancestral Roots of Certain American Colonists Who Came to America before 1700. Eighth ed. (2008), p. 169. Thomas was the progenitorBurke, Bernard, A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire. London: Harrison. 1866. p. 204 of the Geraldine House of Desmond, and brother of Gerald FitzMaurice, 1st Lord of Offaly, progenitor of the Geraldine Houses of Kildare and Leinster.
In 1210, Thomas invaded Connacht with Geoffrey de Marisco as the head of a force of Anglo-Norman troops gathered in Munster, and of followers of Donnchadh Cairbreach Ó Briain, King of Thomond. This expedition aided in forcing Cathal Crobhdearg Ua Conchobair, King of Connacht into negotiations with John de Gray, Justiciar of Ireland.
Marriage and issue Thomas FitzMaurice married Ellinor, daughter of Jordan de Marisco, and sister of Geoffrey de Marisco, who was appointed justiciar of Ireland in 1215.,Cokayne, George Edward, Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant. Volume III. London: George Bell & Sons. 1890. p. 83 and had issue:
John FitzGerald, 1st Baron Desmond
Further reading Thomas FitzMaurice (c.1145–1213) of Shanid, Ireland. Max Brian Yale Genealogical Collection, 2025.
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