Æthelred's defeat at the Battle of the Conwy in 881 ended Mercian domination of north and west Wales, but he violently tried to maintain his rule over the south-east. Alfred the Great, King of the West Saxons, became the competitor of Mercia for the allegiance of the south-eastern Welsh kings, and Æthelred's oppression drove them to voluntarily submit to Alfred and seek his protection. Æthelred himself soon followed in abandoning the attempt to maintain his independence and submitted to the West Saxon king. In his
Life of King Alfred, Asser listed Brochfael among Welsh kings who submitted to King Alfred: :At that time [late 880s], and for a considerable time before then, all the districts of right-hand [southern] Wales belonged to King Alfred, and still do. That is to say,
Hyfaidd, with all the inhabitants of the
kingdom of Dyfed, driven by the might of the six sons of
Rhodri [Mawr], had submitted himself to King Alfred's royal overlordship. Likewise, Hywel ap Rhys (the king of Glywysing) and Brochfael and Ffernfael (sons of Meurig and kings of Gwent), driven by the might and tyrannical behaviour of Ealdorman Æthelred and the Mercians, petitioned King Alfred of their own accord, in order to obtain lordship and protection from him in the face of their enemies. ==Charters==