Bruno, Or Brun (925-965), archbishop of Cologne, third son of the German king, Henry I., the Fowler, by his second wife Matilda, was educated for the church at Utrecht, where he distinguished himself by his studious zeal. In 940 his brother, King Otto, afterwards the emperor Otto the Great, appointed him chancellor, and some years later arch-chaplain, and under his leadership the chancery was reformed and became a training ground for capable administrators. He rendered valuable assistance to his brother Otto in his efforts to suppress the risings which marked the earlier part of his reign, services which were rewarded in 953 when Bruno was made archbishop of Cologne, and about the same time duke of Lorraine. Bruno is chiefly renowned as a scholar and a patron of learning. He consorted eagerly with learned foreigners, tried to secure a better education for the clergy, and was mainly instrumental in making his brother's court a centre of intellectual life. He built many churches, and, aided by the tendency of the time, sought to purify monastic life.

He died at Reims on the 11th of October 965, and was buried in the church of St Pantaleon at Cologne.

See Ruotger, "Vita Brunonis archiepiscopi Coloniensis," in the Monumenta Germaniae Historica, Scriptures, Band iv. (Hanover and Berlin, 1826-1892); E. Meyer, De Brunone I. Archiepiscopo Coloniensi (Berlin, 1867); J.P. Pfeiffer, Historisch-Kritische Beitrage zur Geschichte Bruns I. (Cologne, 1870); K. Martin, Beitrage zur Geschichte Brunos I. von Koln (Jena, 1878).