Lordship of Ireland
His son, Gerald FitzMaurice ("c." 1150-1204), became "jure uxoris" 1st Baron of Offaly, and his descendant John, 4th Baron of Offaly ("c." 1250-1316), became the 1st Earl of Kildare in 1315. Under The 8th Earl of Kildare ("c." 1456-1513), a long-serving Lord Deputy of Ireland, the FitzGerald family reached pre-eminence as the virtual rulers of the Lordship of Ireland between 1477 and 1513. The Lordship of Ireland was replaced by the Kingdom of Ireland in 1542.