When Sigismund died in 1437, the Bohemian estates elected Albert of Austria as his successor. Albert died and his son, Ladislaus the Posthumous – so called because he was born after his father's death – was acknowledged as king. During Ladislaus' minority, Bohemia was ruled by a regency composed of moderate reform nobles who were Utraquists. Internal dissension among the Czechs provided the primary challenge to the regency. A part of the Czech nobility remained Catholic and loyal to the pope. A Utraquist delegation to the Council of Basel in 1433 had negotiated a seeming reconciliation with the Catholic Church. The Compacts of Basel accepted the basic tenets of Hussitism expressed in the Four Articles of Prague: communion under both kinds; free preaching of the Gospels; expropriation of church land; and exposure and punishment of public sinners. The pope, however, rejected the compact, thus preventing the reconciliation of Czech Catholics with the Utraquists.