Richeza of Lotharingia was a member of the Ezzonen dynasty who became queen of Poland as the wife of Mieszko II Lambert. Her Polish marriage was arranged to strengthen the ties between Mieszko and her uncle Emperor Otto III. She returned to Germany following the deposition of her husband in 1031, either divorcing or separating from him. Upon the death of her brother Duke Otto II of Swabia and the consequent extinction of the male line of her family, Richeza became a nun, worked to preserve the Ezzonen heritage, and funded the restoration of the Abbey of Brauweiler. She has been beatified.

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.