Wessex in classical heraldry and is found on a number of church windows in derived shields such as the Arms of the Collegiate Church of St Peter at Westminster (Westminster Abbey, which was founded by the king). At its greatest extent Wessex encompassed the modern areas of Hampshire, Isle of Wight, Dorset and Wiltshire, as well as the western half of Berkshire and the eastern hilly flank of Somerset. This covers an area of about . The English author Thomas Hardy used a fictionalised Wessex as a setting for many of his novels, adopting his friend William Barnes' term "Wessex" for
Wessex 890s, Wessex and English Mercia continued to be attacked by the Danish settlers in England, and by small Danish raiding forces from overseas, but these incursions were usually defeated, while there were no further major invasions from the continent. The balance of power tipped steadily in favour of the English. In 911 Ealdorman Æthelred died, leaving his widow, Alfred's daughter Æthelflæd, in charge of Mercia. Alfred's son and successor Edward the Elder, then annexed London, Oxford and the surrounding area, probably including Middlesex, Hertfordshire, Buckinghamshire and Oxfordshire, from Mercia to Wessex. Between 913 and 918 a series of English offensives