Adelaide was the only daughter of Otto, Count of Ballenstedt, and Eilika, daughter of Magnus Billung, Duke of Saxony.
Adelaide's first husband was Henry IV, Count of Stade (d.1128).
[2] In 1139 Adelaide married for a second time to Werner of Velthim, count of Osterburg (d. after 1169).
[3] According to the Annales Stadenses, Werner was a vassal (vassus) of Adelaide's brother, Albert the Bear.
[4] With Werner, Adelaide had at least one son: Albert of Osterburg.