Ælfthryth ( -- 1000 or 1001 , also Alfrida , Elfrida or Elfthryth ) was the second or third wife of King Edgar of England .
Ælfthryth ( c. 945 - 1000 or 1001 , also Alfrida , Elfrida or Elfthryth ) was the second or third wife of King Edgar of England .