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Wiki information Glywys:
Glywys is a legendary early 5th century Welsh king, an important character in early Welsh genealogies as the eponymous founder king of Glywysing, a south-east Welsh kingdom whose heartland lay between the Tawe and the Usk. In one genealogy Glywys is...
Glywysing was, from the sub-Roman period to the Early Middle Ages, a petty kingdom in south-east Wales. Its people were descended from the Iron Age tribe of the Silures.