The Lords of Westerlo were the feudal lords of the fiefdom of Westerlo until the abolition of feudalism in 1795. The first known Lord of Westerlo was the Frankish nobleman Ansfried of Utrecht who gave
Guy de Brimeu in the Armorial of the Order of the Golden Fleece (The Hague, KB, 76 E 10, fol. 75v)