His family had come over with William the Conqueror in 1066. When Henry II's 1171 attack on Ireland proved successful, Henry sent FitzAldhelm and Hugh de Lacey to receive the allegiance of the King of Connaught, Rory. FitzAldhelm was put in charge of the city of Wexford, but when the Lord of Leinster, "Strongbow" (Richard de Clare, 2nd Earl of Pembroke), died in 1176, FitzAldhelm was made Henry's deputy over the whole of Ireland and ward to the earl's daughter Isabel (one of the wealthiest heiresses in Wales and Ireland).
Unfortunately for FitzAldhelm, Henry was working out how to use his sons to control his Angevin Empire. His youngest, John, was soon to be a teenager, and Henry named John the Prince of Ireland a mere year after FitzAldhelm's rule over the island, leaving FitzAldhelm Wexford and Leinster. As it turns out, however, FitzAldhelm was once again put in charge of Ireland in 1181 as Henry's dapifer ("steward").
Around that time he founded the monastery of St. Thomas theMartyr at Dublin, a monastery of Dromore, and the Abbey of Athassel in Tipperary.
Gerald of Wales gives us a description of FitzAldhelm:
This FitzAdelm was large and corpulent, both in stature and shape, but of a reasonable height. He was a pleasant and courtly man; but whatever honours he paid to any one were always mingled with guile. There was no end of his craftiness - there was poison in the honey, and a snake in the grass. To outward appearance he was liberal and courteous, but within there was more aloes than honey.
He died in 1204/5 and was buried at the Abbey of Athassel.
How did all this come about? The taking of Ireland, I mean; it wasn't just a matter of Henry saying "Here I am; bow down." Tomorrow we'll take a look at what the Anglo-Norman Invasion of Ireland involved, and what the pope and the Irish Church thought of it.