died in 1172, as King William II did not marry until 1177 and his marriage remained childless (or ever had a son named Bohemond in 1181), Constance became the sole heir to the Sicilian crown; nonetheless, while said to have been designated the heir and sworn fealty to in 1174, she remained confined to her convent with her marriage seemingly beyond consideration until she was 30 years old.

Her betrothal to Henry, King of the Romans, was announced 29 Oct 1184 at the Augsburg episcopal