After her husband's death on 5 October 1056, Empress Agnes served as regent on behalf of her young son Henry IV. Henry III had secured the
election of his son as
King of the Romans on his deathbed. Aided by Abbott Hugh of Cluny and
Pope Victor II, also
bishop of Eichstätt, Agnes tried to continue her husband's politics and to strengthen the rule of the
Salian dynasty. However, despite being related to kings of Italy and Burgundy, she gained little respect as a leader. The loss of some of her family's ancestral lands later weakened her son's position tremendously. To win allies, she gave away three German
duchies: and to replace him by the
bishop of Florence,
Nicholas II. Thereafter, on Easter 1059 Nicholas issued the momentous papal bull
In nomine Domini establishing the
cardinals as the sole electors of the pope, denying this power to the emperor and all temporal rulers, including Agnes herself. When Pope Alexander II was elected on 30 September 1061, Empress Agnes refused to acknowledge him and had
Honorius II elected. This
schism did not end until Pentecost 1064. The empress' candidate could not prevail against the Roman Curia; in consequence, Agnes retired from politics, leaving the regency to her confidant Bishop
Henry II of Augsburg. Bishop Henry did not receive wide acceptance due to his awkward and haughty manners, as well as scandalous rumours about his relationship with the empress, as recorded by
Lambert of Hersfeld. Moreover, the fact that the heir to the throne was raised by common
ministeriales provoked anger among the
princes. In 1062, young Henry IV was abducted by a group including Archbishop
Anno II of Cologne and Otto of Nordheim, in a conspiracy to remove Agnes from the throne, referred to as the
Coup of Kaiserswerth. Henry was brought to
Cologne, and despite jumping overboard to escape, he was recaptured. From this point, the power shifted to Rome, as the pope elected the emperor. Defeated, Agnes resigned as regent and was replaced by Anno together with the archbishops
Siegfried of Mainz and
Adalbert of Bremen. ==Later life==