Research Notes:

The name of Robert's first wife is not known. However, as King Robert's known wife Béatrix de Vermandois could not have been the mother of his daughter Adela (married to the brother of Béatrix) it is assumed that this earlier marriage is correct. According to Europäische Stammtafeln, Robert's first wife was named Aelis. This may be based on the 21 May 907 donation of Rebais abbey to the church of Paris which refers to "comitis Rotberti et Adele comitisse". However,... this is more likely to refer to Robert and his daughter than to his wife. ¹