England–Wales border point. In 926, Edward's successor Athelstan, "King of the English", summoned the Welsh kings including Hywel Dda of Deheubarth to a meeting at Hereford, and according to William of Malmesbury laid down the boundary between England and Wales, particularly the disputed southern stretch where he specified that the eastern bank of the Wye should form the boundary. By the mid-eleventh century, most of Wales had become united under the king of Gwynedd, Gruffudd ap Llywelyn. In 1055, he marched on Hereford and sacked the city. He also seized Morgannwg and the Kingdom of Gwent, together with substantial territories east of
England–Wales border of Wessex in about 885. Alfred's son Edward the Elder also secured homage from the Welsh, although sporadic border unrest continued. In the early 10th century, a document known as "The Ordinance Concerning the Dunsaete" records procedures for dealing with disputes between the English and the Welsh, and implies that areas west of the Wye in Archenfield were still culturally Welsh. It stated that the English should only cross into the Welsh side, and vice versa, in the presence of an appointed man who had the responsibility of making sure that the foreigner was safely escorted back to the crossing