About this time there was a royal residence at Faringdon, for it is recorded that Edward the Elder died there in 925. His son Athelstan had a mint at Wallingford, and three coins struck by him at that place are in the collection at the British Museum. The monastery at Abingdon had been destroyed by the Danes, and St Ethelwold was told by King Edred to re-establish it, but the work was not accomplished until the reign of Edgar. Ethelred the Unready had a mint at Reading. In 1006 the Danes again appeared in Berkshire and burnt Reading. They then advanced up the Thames to Wallingford and burnt that town. They did not, however, remain in the county, but carried their booty to the sea by way of Winchester. Both Reading and Wallingford were soon rebuilt. Edward the Confessor struck coins at both these towns, and there are specimens in the British Museum. The Confessor had a residence at Old Windsor, and the great Earl Godwin is said to have died there in a manner attributed to the judgment of God. The King gave Windsor to the Abbey of Westminster, but William the Conqueror exchanged it for some land in Essex, and built a castle on the chalk hill near the Thames where the present Windsor Castle stands. Ever since the time of the Conqueror Windsor has been a favourite residence of our Sovereigns. In 1121 Reading Abbey was founded by King Henry I and the first Abbot was appointed in 1123. Henry added to the buildings at Windsor, and his marriage to his second wife Adelais, daughter of Godfrey Count of Louvain, took place there in 1121. There was at this time a castle at Wallingford, for it is recorded that Waleran, Earl of Mellent, was imprisoned there in 1126.