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In page Agnes of Poitou:

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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[citation needed]. 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.[3]