BRUNO or BRUN (925-965), archbishop of Cologne, third son of the German king, Henry I., the Fowler, was educated for the church at Utrecht. In 94o his brother, King Otto, afterwards Emperor Otto the Great, appointed him chancellor, and under his leadership the chancery was reformed and became a training ground for capable administrators. He helped his brother Otto to suppress the risings which marked the earlier part of his reign, services which were rewarded in 953 when Bruno was made arch bishop of Cologne, and about the same time duke of Lorraine. Bruno consorted eagerly with learned foreigners, tried to secure a better education for the clergy, and was mainly instrumental in making his brother's court the centre of intellectual life in Ger many. He built many churches, and, aided by the tendency of the time, sought to purify monastic life. He died at Reims, Oct. I 1, 965, and was buried in the church of St. Pantaleon at Cologne.
See Ruotger, "Vita Brunonis archiepiscopi Coloniensis," in Migne, Patrol. Lat. v. 134 ; E. Meyer, De Brunone I. Archiepiscopo Coloniensi (1867) ; J. P. Pfeiffer, Historisch-Kritische Beitriige zur Geschichte Bruns I. (Cologne, 187o) ; K. Martin, Beitrage zur Geschichte Brunos I. von Köln (Jena, 1878).