The Knight of Glin (Irish: Ridire an Ghleanna; dormant 14 September 2011), also known as the Black Knight or Knight of the Valley, was a hereditary title held by the FitzGerald and FitzMaurice families of County Limerick, Ireland, since the early 14th century. The family was a branch of the FitzMaurice/FitzGerald Dynasty commonly 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").