Aethelflaed, Lady of the Mercians
Æthelflæd was the oldest daughter of King Alfred. She was wife of Æthelred, ealdorman of Mercia, and after his death, ruler of Mercia (911–918).
http://early-middle-ages.suite101.com/article.cfm/aethelflaed-lady-of-the-mercians
Aefthryth, Countess of Flanders
Ælfthryth was the last child of King Alfred the Great. Ælfthryth married Baldwin II Count of Flanders.
Saint Ethelgiva, King Alfred's Daughter
below is a link to a site that tells about both King Alfred's daugher, Ethelgiva, and his wife being Saints.
Picture of Aethelflaed from bing images.