Anno was religious as a child and entertained thoughts of a military life, but he was guided by his uncle into an ecclesiastical state. In 1055 he became the archbishop of Cologne. He was canonised in 1183 by Pope Lucius III. He was a founder or co-founder of monasteries (Michaelsberg, Grafschaft and Affligem) and a builder of churches, advocated clerical celibacy and introduced a strict discipline in a number of monasteries. He was a man of great energy and ability, whose action in recognizing Alexander II was of the utmost consequence for Henry IV and for Germany.