Æthelstan of Abingdon
Encyclopedia
Æthelstan, Abbot of Abingdon.

Æthelstan became Abbot of Abingdon about 1044, following Siward
Siward
Siward may refer to:* Siward, king of Götaland* Siward , Bishop of St. Martins* Siward, Earl of Northumbria , Anglo-Scandinavian earl of Northumbria...

's promotion, and died in 1047 or 1048 (Kelly 2000).
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