Ancestral Roots of Certain American Colonists Who Came to America Before 1700, created by Frederick Lewis Weis, 8th edition, page 2, Line 1-17
17. EDGAR, 'the Peaceful' King of England, 959-975; b. 944; d. 975; m. (2) Aelfthryth (Elfrida), b. 945; d. 1000, a nun at Wherwell; dau. of Ealdorman Ordgar of Devon (ASC, 965; NSE X: 165-166: 365; ES II/78).
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Edgar (Old English: Eadgar, [æ??d???r]; c.?943 – 8 July 975), known as the Peaceful or the Peaceable, was King of England from 959 until his death. He was the younger son of Edmund I and Ælfgifu of Shaftesbury, and came to the throne as a teenager, following the death of his older brother Eadwig. As king, Edgar further consolidated the political unity achieved by his predecessors, with his reign being noted for its relative stability. His most trusted advisor was Dunstan, whom he recalled from exile and made Archbishop of Canterbury. The pinnacle of Edgar's reign was his coronation at Bath in 973, which was organised by Dunstan and forms the basis for the current coronation ceremony. After his death he was succeeded by his son Edward, although the succession was disputed.

Ælfthryth (c.? 945 – 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 was the daughter of Ealdorman Ordgar. Her mother was a member of the royal family of Wessex. The family's power lay in the west of Wessex. Ordgar was buried in Exeter and his son Ordwulf founded, or refounded, Tavistock Abbey.[1]

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Ælfthryth was first married to Æthelwald, son of Æthelstan Half-King as recorded by Byrhtferth of Ramsey in his Life of Saint Oswald of Worcester.[2] Later accounts, such as that preserved by William of Malmesbury, add vivid detail of unknown reliability.
According to William, the beauty of Ordgar's daughter Ælfthryth was reported to King Edgar. Edgar, looking for a Queen, sent Æthewald to see Ælfthryth, ordering him "to offer her marriage [to Edgar] if her beauty were really equal to report." When she turned out to be just as beautiful as was said, Æthelwald married her himself and reported back to Edgar that she was quite unsuitable. Edgar was eventually told of this, and decided to repay Æthelwald's betrayal in like manner. He said that he would visit the poor woman, which alarmed Æthelwald. He asked Ælfthryth to make herself as unattractive as possible for the king's visit, but she did the opposite. Edgar, quite besotted with her, killed Æthelwald during a hunt.[3]
3. Malmesbury, pp. 139–140 (Book 2, § 139.