Simon Douglas Keynes, MA, PhD, LittD, FBA (// KAYNZ; born 23 September 1952) is the current Elrington and Bosworth Professor of Anglo-Saxon in the Department of Anglo-Saxon, Norse, and Celtic at Cambridge University.
Keynes is the fourth and youngest son of Richard Darwin Keynes and his wife Anne Adrian, and thus a member of the Keynes family (and, by extension, of the Darwin-Wedgwood family). His elder brothers are the conservationist and author Randal Keynes and the medical scientist and fellow fellow of Trinity Roger Keynes. He is the grandson of the surgeon Geoffrey Keynes and Nobelist Edgar Douglas Adrian, 1st Baron Adrian, grandnephew of the economist John Maynard Keynes and great-great-grandson of Charles Darwin. He has a son with the musicologist and architectural historian Tethys Carpenter.
He was born in Cambridge and educated at King's College School, The Leys School and Trinity College, Cambridge. He was lecturer in Anglo-Saxon History at Cambridge from 1978, reader in Anglo-Saxon History from 1992, and Elrington and Bosworth Professor of Anglo-Saxon, from 1999. He has been a fellow of Trinity College since 1976. From 1999 to 2006 he was head of the Department of Anglo-Saxon, Norse and Celtic.
Keynes is also co-editor of Anglo-Saxon England and is on the editorial board of Cambridge Studies in Anglo-Saxon England. From 1993 to 2004 he was associate editor of the Oxford Dictionary of National Biography.
- The Diplomas of King Aethelred The Unready (978–1016): A Study in Their Use as Historical Evidence, 1980
- Alfred the Great: Asser’s Life of King Alfred and Other Contemporary Sources, 1983 (trans., author of intro and notes, with M. Lapidge)
- Facsimiles of Anglo-Saxon Charters, 1991
- The Liber Vitae of the New Minster and Hyde Abbey Winchester, 1996
- Keynes, Simon. The Writers Directory 2008. Ed. Michelle Kazensky. 23rd ed. Vol. 1. Detroit: St. James Press, 2007. 1066. Gale Virtual Reference Library. Accessed 29 Nov. 2010.(subscription required)
- Who's Who 2010, London, A & C Black (2009), pp 1271–2, ISBN 978-1-4081-1414-8
- Keynes entry in Debrett's People of Today