Here Boniface met Beatrice of Lorraine, niece and foster daughter of Empress Gisela of Swabia with whom a marriage covenant could be arranged. According to the agreements, Beatrice brought important assets in Lorraine: the Château of Briey and the Lordships of Stenay, Mouzay, Juvigny, Longlier and Orval, all the northern part of her paternal family's ancestral lands.
Thereupon Boniface encountered Beatrice of Lorraine, niece and foster child of Empress Gisela of Swabia, with whom a marital agreement could be negotiated. In accordance with the agreements, Beatrice contributed significant assets in Lorraine: the Château of Briey and the Lordships of Stenay, Mouzay, Juvigny, Longlier, and Orval, encompassing the northern portion of her paternal family's ancestral territories.