Battle of Deorham
The Battle of Deorham
occurred in 577
between the West Saxons
and the Celts
. Deorham is usually taken to refer to Dyrham, Wiltshire. The battle is considered by some to be decisive since it drove a land wedge between the Celts of what is now (approximately) Wales
and those occupying territory to the south-west, e.g. what are (approximately) now Somerset
However, passage through this area by Welsh-speaking individuals was not impossible: a genealogy of Welsh aristocrats notes that the descendants of kings who ruled in Powys founded a dynasty of rulers in the Glastonbury region in the eighth century.