Siward (Abbot of Abingdon)

Siward (died 1048) was Abbot of Abingdon in Berkshire (now Oxfordshire) and Bishop of St Martin's.

Siward was a monk at Glastonbury until he was appointed Abbot of Abingdon in 1030. He was made Bishop of St Martins in 1044, but resigned and died in 1048 (Kelly 2000).

...
Wikipedia