Agnes of Poitou has served since her…
1062 CE
Agnes of Poitou has served since her husband's death in 1056, as regent during on behalf of young son, Henry IV.
Despite being related to kings of Italy and Burgundy, Agnes is not known as a quality leader.
During her rule, she has given away three duchies, Bavaria, Swabia, and Carinthia, to relatives.
Agnes opposes church reform, and takes the side of Italian dissidents who do as well.
Pope Stephen IX, unable to take actual possession of Rome due to the Roman aristocracy's election of an antipope, Benedict X, had sent Hildebrand of Sovana and Anselm of Lucca (respectively, the future Popes Gregory VII and Alexander II) to Germany to obtain recognition from Agnes.
Stephen had died before being able to return to Rome, but Agnes' help had been instrumental in letting Hildebrand depose the Antipope in 1059 and with Agnes' support replace him by the Bishop of Florence, Nicholas II.
Henry IV and his mother in early April 1062, are staying in the palace of Kaiserswerth (today a quarter in Düsseldorf).
Here they both meet with Archbishop Anno II of Cologne.
After banqueting together, Anno invites the eleven-year-old boy to visit a magnificent ship that he has moored in the River Rhine nearby.
Anno then takes the king to Cologne and blackmails Empress Agnes to hand over the Imperial Regalia.
As a consequence of what is referred to as referred to as the Coup of Kaiserswerth, the power of the state falls into the hands of the rebels, who, in addition to Anno and Count Egbert of Brunswick, mentioned by Lampert, also include Otto of Northeim and the Archbishops Adalbert of Bremen and Siegfried I of Mainz.