She has been called a lot of things... Adelaide, Adela Alys or Alix, noone seems quite sure. She was born in 1160 to Constance of Castile the second wife of Louis VII, who died giving birth.
Alix was engaged to Richard as early as 1171, but it seems she started an affair with Henry and may have had a child by him. She was still engaged to Richard when he ascended the throne twenty years later, but he then sent her home due to her "bad name". Her brother Philippe Augustus (possible boyfriend of Richard!) wanted to marry her to John, but he wasn't interested in his father's cast-offs either!
Alix was eventually married in 1195 (very late) to Guillaume II Talvas (1178-1221), comte de Ponthieu.
She had three children with him:
1) Jean II de Ponthieu, died young
2) Marie de Ponthieu (? - 1250 ou 1251), who married Simon de Dammartin comte d'Aumale et de Dammartin (? - 1239), and inherited Ponthieu. She married secondly Mathieu de Montmorency (? - 1250).
3) Isabelle de Ponthieu, abbesse d'Épagne.