Asser (died c. 909)

Welsh monk and scholar who became the mentor and friend of Alfred the Great, King of Wessex. His biography of the king, De rebus gestis Aelfredi magni, which follows Alfred's career from his birth to 887 and describes his reign and wars in great detail, is the main source of historical knowledge of that period.

Asser was born in Pembrokeshire, in west Wales, and entered the monastery of St David's. he was later appointed Bishop of Sherborne, in Dorset.