Æthelstan, the first English king to achieve…
936 CE
Æthelstan, the first English king to achieve lordship over northern Britain, had inherited his authority over the Welsh kings from his father and aunt.
Gwent had in the 910s acknowledged the lordship of Wessex, and Deheubarth and Gwynedd had accepted that of Æthelflæd of Mercia; following Edward's takeover of Mercia, they had transferred their allegiance to him.
According to William of Malmesbury, after the meeting at Eamont in 927, Æthelstan had summoned the Welsh kings to Hereford, where he imposed a heavy annual tribute and fixed the border between England and Wales in the Hereford area at the River Wye.
The dominant figure in Wales is Hywel Dda of Deheubarth, described by the historian Thomas Charles-Edwards as "the firmest ally of the 'emperors of Britain' among all the kings of his day".
Welsh kings have attended Æthelstan's court between 928 and 935 and witnessed charters at the head of the list of laity (apart from the kings of Scotland and Strathclyde), showing that their position was regarded as superior to that of the other great men present.
The alliance has produced peace between Wales and England, and within Wales, lasting throughout Æthelstan's reign, though some Welsh resent the status of their rulers as sub-kings, as well as the high level of tribute imposed upon them.
In Armes Prydein Vawr (The Great Prophecy of Britain), a Welsh poet foresaw the day when the British would rise up against their Saxon oppressors and drive them into the sea.