Sir Gerald Fitzgerald, 3rd Lord Decies was the son of John Fitzgerald and Ellen, daughter of Maurice FitzGibbon, the White Knight, and was the third of the Lords of Decies.
The Decies property was originally a part of the Desmond estate until James, the 8th Earl of Desmond, bequeathed to his younger son, Gerald, Decies and Dromana Castle.
Sir Gerald Fitzgerald married Ellice, daughter of Piers Butler, 8th Earl of Ormond and had issue: