 He was also a noted amateur composer.Although the family home of the Duke of Leinster was Carton House near Maynooth, County Kildare (Ireland), FitzGerald was born at Harrington House, Northamptonshire (England), the home of his mother.He was the third son of Augustus FitzGerald, 3rd Duke of Leinster, by his wife Lady Charlotte Augusta Stanhope, daughter of General Charles Stanhope, 3rd Earl of Harrington.