This name derives from the Old English (Anglo-Saxon) name “Ælfþryð”, meaning "elf strength" from the element “ælf” (elf) combined with “þryð” (strength). The name fell out of fashion in the middle ages and was revived in the 19th century in both England and Germany. Ælfthryth was 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. As Mother of King Æthelred the Unready, she was a powerful political figure.