Herman's younger brother Otto became Duke of Swabia in 1045; among his sisters were Richeza, who married the Polish King Mieszko II Lambert, and Theophanu, Abbess of Essen.
[3] Pope Benedict IX elevated him to the College of Cardinals around 1036, at the same time the Salian Emperor Conrad II appointed him Archbishop and granted important privileges to the Church in Cologne.
Herman accompanied Conrad on his Italian campaign and remained loyal to his successor Henry III.
His claritas generis allowed him to baptise and crown the emperor's newborn son Henry IV, a privilege that was disputed by Archbishop Luitpold I of Mainz.
[4] As Cologne archbishop he served as Archchancellor of the Italian kingdom (Regnum Italicum) and is also mentioned as protector of Brauweiler Abbey (1053).