Adelaide of Ballenstedt
Adelaide of Ballenstedt was the daughter of Otto of Ballenstedt and a member of the House of Ascania. She married, successively, Henry IV, Count of Stade, and Werner, Count of Osterburg.
Family
Adelaide was the only daughter of Otto, Count of Ballenstedt, and Eilika, daughter of Magnus Billung, Duke of Saxony. Her brother was Albert the Bear.
Adelaide's first husband was Henry IV, Count of Stade. The couple had no recorded children together.
In 1139 Adelaide married for a second time to Werner of Velthim, count of Osterburg. According to the Annales Stadenses, Werner was a vassal of Adelaide's brother, Albert the Bear. With Werner, Adelaide had at least one son: Albert of Osterburg.