Ezzo was the son of the Lotharingian count palatineHerman I and his wife Heylwig of Dillingen. He was sent as a child to be educated by Bishop Ulrich of Augsburg, a relative of his mother. Nothing is known about his youth. Having married Matilda of Germany, a daughter of Emperor Otto II and his consort Theophanu, Ezzo became prominent during the reign of his brother-in-law, Emperor Otto III. The marriage was expressly consented by the Dowager Empress Theophanu, probably to rally the powerful family of Ezzo to the throne. Matilda received as dowry out of Ottonian possessions lands in Thuringia and in the Duchy of Franconia, while her husband gave her as dowry the family estate of Brauweiler near Cologne. At the death of his father in 996, Herman's rich allodial property was shared between his sons. Ezzo received lands in Cochem on the Mosel river, in Maifeld, the Flamersheimer Wald and estates around Tomburg Castle near Rheinbach, as well as half the usufruct of Villewaldin. About the same time, he must have received the Palatinate and previous comital rights, as he is referred as count in the Auelgau in 1015 and as Count Palatine in the Bonngau in 1020. He also received the county of Ruhrgau with tutelage of Essen Abbey. Unsuccessful candidate to the imperial throne upon the death of Emperor Otto III in 1002, his relation with the new Ottonian king Henry II was immediately very tensed. Henry disputed Ezzo's ownership of territories, that he defended as his wife's inheritance of late Otto III. The conflict dragged on for years and reached its peak in 1011. Facing disturbances in Lotharingia, and in need for Ezzo's military support, Henry was forced to come to terms. Ezzo's victory led the king to make concessions and to a complete transformation of its policy. He reconciled with Ezzo, recognized its rights of inheritance and gave him the royal territories of Kaiserswerth, Duisburg as well as Saalfeld in Thuringia for renouncing to the throne. He also associated the Ezzonid dynasty to his Eastern policies, and mediated the marriage of Ezzo's daughter Richeza with the heir to the Polish throneMieszko II Lambert. These huge territorial concessions made Ezzo one of the most powerful princes in the Empire. Ezzo's growing power and the increased prestige of his house were reflected in the founding of the family, Brauweiler Abbey, the place where his marriage had been celebrated and whose construction begun after a trip to Rome of the couple in 1024. The Benedictine monastery, which was consecrated in 1028 by Archbishop Pilgrim of Cologne, was to be the grave and spiritual centre of the Ezzonid dynasty. The first member of the family buried there was Ezzo' wife Matilda, who died on 4 November 1025. Very little is known about Ezzo's later life, but we are told that he died at a great age at Saalfeld on 21 March 1034, and was buried in Brauweiler. Ezzo has been quite an impressive personality, even if the reporting on his life and offices, described by the glorifying author of Fundatio monasterii Brunwilarensis may be exaggerated. He was mostly active in political affairs when it came to his own interests and the standing of his house, and where he could increase his territories and authority. His dexterous management of the favours of Empress Theophano, Emperor Otto III and later Henry II, testify of his personal ambition and political dexterity.
Children
Ezzo and Mathilda left three sons and seven daughters. The first two sons, Liudolf and Otto were aimed at perpetuating the dynasty while the third Hermann, was raised to enter the clergy. Of the seven daughters only Richeza was conspicuously married, while the others were placed in monasteries of which they all became abbesses.
