Humbert

(c. A.D. 1000–1061) Was a French Benedictine monk and friend of Pope Leo IX, who sent Humber to Constantinople to mediate a dispute with the Eastern Church over the West’s change of the Nicene Creed. Humbert was a strong advocate of papal supremacy and when he was unable to bring the Eastern Church into conformity with the West, he excommunicated their Patriarch precipitating the final division between the Eastern and Western Churches.