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In page Æthelstan:

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Æthelstan's later education was probably at the Mercian court of his aunt and uncle, Æthelflæd and Æthelred, and it is likely the young prince gained his military training in the Mercian campaigns to conquer the Danelaw. According to a transcript dating from 1304, in 925 Æthelstan gave a charter of privileges to St Oswald's Priory, Gloucester, where his aunt and uncle were buried, "according to a pact of paternal piety which he formerly pledged with Æthelred, ealdorman of the people of the Mercians".[17] When Edward took direct control of Mercia after Æthelflæd's death in 918, Æthelstan may have represented his father's interests there.[2]