"Conrad was bishop of Utrecht between 1076 and 1099.
Before becoming bishop he was chamberlain of Archbishop Anno II of Cologne and, for a time, tutor of Prince Henry, the future Emperor Henry IV. When the excommunicated Bishop William of Utrecht died in 1076, the emperor gave the episcopal see of Utrecht to Conrad, who, like his predecessor, sided with Henry IV in his conflicts with Gregory VII, and at the Synod of Brixen in 1080 even condemned the pope as a heretic.
The contemporary annalist, Lambert of Hersfeld, calls Conrad a schismatic bishop, unworthy of holding an episcopal see. In a battle with Robert I, Count of Flanders, Conrad was defeated, afterwards taken captive and compelled to yield part of West Frisia to Robert. This territorial loss of the bishop was compensated by the emperor, who, in 1077, gave him the district of Stavoren, and in 1086 added the two other Frisian districts, Oostergo and Westergo. He was in Rome when king Henry was crowned by the pope as emperor in 1084." - (en.wikipedia.org 13.03.2021)