When the Western Schism began in 1378, splitting the Catholic world between two rival popes, the Bishop of Grasse backed Pope Urban VI even though Marie de Blois, mother of and regent to the infant Count Louis II of Provence, was a supporter of Urban's enemy Antipope Clement VII. In 1383 Marie therefore confiscated the Lordship of Antibes from the Bishops of Grasse and two years later awarded it to the brothers Marc and Luc Grimaldi, of the Genoese House of Grimaldi. The new Grimaldi lords built the Château Grimaldi as their residence in the town.