The Ezzonids were a dynasty of Lotharingian stock dating back as far as the ninth century. They attained prominence only in the eleventh century, through marriage with the Ottonian dynasty of Holy Roman Emperors. Named after Ezzo, Count Palatine of Lotharingia from 1015 to 1034, they dominated the politics of the middle and lower Rhine and usually represented the royal interests. Under the Salian Emperors, they even briefly held the dukedoms of Swabia, Carinthia, and Bavaria.

Ezzo, sometimes called Ehrenfried, a member of the Ezzonid dynasty, was Count Palatine of Lotharingia from 1015 until his death. As brother-in-law of Emperor Otto III, father of Queen Richeza of Poland and several other illustrious children, he was one of the most important figures of the Rhenish history of his time.