At Wallingford, Duke William and his troops ford the River Thames. Wallingford was the lowest point at which the river could be forded, adding a further 100 miles to their journey. It is here at Wallingford that Archbishop Stigand is thought to have conceded and sworn his oath of allegiance to William, having earlier denounced the election of Edgar Aetheling. Wallingford castle was built between 1067 and 1071 by Robert d’Oiley. In 1335 the castle became the principal residence of the Black Prince. In the lower border appears the fable of ‘The Frogs asking for a King.’ The moral to this fable is ‘If you seek change, make sure it is for the better.’