John FitzGerald, 4th Earl of Desmond (died 1399) was the son of Gerald FitzGerald, 3rd Earl of Desmond.Burke, Bernard, A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire. London: Harrison. 1866. p. 204Cokayne, 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 He married and had one son, Thomas, who succeeded him as Earl of Desmond.
According to Burke, John FitzGerald married Joan Roche, the daughter of Lord Fermoy. On 4 March 1399, FitzGerald drowned at Ardfinnan on the River Suir, returning from an incursion into the territory of the Earl of Ormond.Ireland and her people; a library of Irish biography, (Thomas W. H. Fitzgerald, ed.), Fitzgerald Book Company, 1910, p. 188
He was buried at Youghal, and succeeded by his son Thomas FitzJohn FitzGerald, 5th Earl of Desmond.
References