known as the Geraldines and related to the now extinct Earls of Desmond who were granted extensive lands in County Limerick by the Crown. The title was named after the village of Glin, near the Knight's lands. The Knight of Glin was properly addressed as "Knight" (not, as one might expect, "Sir ______ FitzGerald").

The family name "FitzGerald" comes from the (Norman) French