Family Æthelflæd was born around 870, the oldest child of King Alfred the Great and his Mercian wife, Ealhswith, who was a daughter of Æthelred Mucel, ealdorman of the Gaini, one of the tribes of Mercia. Ealhswith's mother, Eadburh, was a member of the Mercian royal house, probably a descendant of King Coenwulf (796–821). Æthelflæd was thus half-Mercian and the alliance between Wessex and Mercia was sealed by her marriage to Æthelred, Lord of the Mercians. They are mentioned in Alfred's will, which probably dates to the 880s. Æthelflæd, described only as "my eldest daughter", received an estate and 100 mancuses, while Æthelred, the only ealdorman to be mentioned by name, received a sword worth 100 mancuses. Æthelflæd was first recorded as Æthelred's wife in a charter of 887, when he granted two estates to the see of Worcester "with the permission and sign-manual of King Alfred" and the attestors included "Æthelflæd conjux". The marriage may have taken place earlier, perhaps when he submitted to Alfred following the recovery of London in 886. Æthelred was much older than Æthelflæd and they had one known child, a daughter called Ælfwynn. Æthelstan, the eldest son of Edward the Elder and future king of England, was brought up in their court and, in the view of Martin Ryan, certainly joined their campaigns against the Vikings. Æthelred's descent is unknown. Richard Abels describes him as "somewhat of a mysterious character", who may have claimed royal blood and been related to King Alfred's father-in-law, Ealdorman Æthelred Mucel. In the view of Ian Walker: "He was a royal ealdorman whose power base lay in the south-west of Mercia in the former kingdom of the Hwicce around Gloucester". Alex Woolf suggests that he was probably the son of King Burgred of Mercia and King Alfred's sister Æthelswith, although that would mean that the marriage between Æthelflæd and Æthelred was uncanonical, because Rome then forbade marriage between first cousins. Æthelflæd and Æthelred Compared to the rest of England, much of English Mercia —Gloucestershire, Worcestershire, Herefordshire and Shropshire —was unusually stable in the Viking age. It did not suffer major attacks and it did not come under great pressure from Wessex. Mercian scholarship had high prestige at the courts of Alfred and Edward. Worcester was able to preserve considerable intellectual and liturgical continuity and, with Gloucester, became the centre of a Mercian revival under Æthelred and Æthelflæd that extended