. "Joscelin of Louvain"@en . . "Flemish noble" . "Joscelin of Louvain, also spelled Jocelin de Louvain and Jocelyn of Leuven, (1121\u20131180) was a nobleman from the Duchy of Brabant who settled in England having married an English heiress. Through his youngest son, the House of Percy \u2014 as the Earls and later the Dukes of Northumberland\u2014became the most powerful family in Northern England. He was brother-in-law to King Henry I, whose second wife was Joscelin's sister Adeliza of Louvain."@en . . . "1121Z"^^ . . . . . "1180Z"^^ . "Jocelin de Louvain, Jocelyn of Leuven"@en .