Ælfthryth (Alfrida, Elfrida) , of Devon

  General Notes:

https://en.wikipedia.org/wiki/%C3%86lfthryth,_wife_of_Edgar
Ælfthryth (c.? 945 \endash 1000 or 1001, also Alfrida, Elfrida or Elfthryth) was an English queen, the second or third wife of King Edgar of England. Ælfthryth was the first king's wife known to have been crowned and anointed as Queen of the Kingdom of England. Mother of King Æthelred the Unready, she was a powerful political figure. She was possibly linked to the murder of her stepson King Edward the Martyr and appeared as a stereotypical bad queen and evil stepmother in many medieval histories.

Ælfthryth married Edgar "The Peaceful" OF WESSEX , King of the English, son of Edmund I OF WESSEX , King of the English and Ælfgifu OF SHAFTESBURY Saint Elgiva, in 964-965. (Edgar "The Peaceful" OF WESSEX , King of the English was born about 943 and died on 8 Jul 975 in Winchester, Hampshire, England.)