George Osborne SaylesFBA (21 April 1901 – 28 February 1994) was an Englishhistorian best known for his work on the medieval English law courts and the early English Parliaments.
G.O. Sayles was an outstandingly original and productive historian whose publications over more than 60 years radically changed understanding of the medieval British parliament and advanced very considerably knowledge of the medieval English law courts.[2]
During his lifetime he held the following positions: Assistant in History, Glasgow University 1924-25, Lecturer 1925-34, Senior Lecturer 1934-45; Professor of Modern History, Queen's University Belfast 1945-53; Burnett-Fletcher Chair of History, University of Aberdeen 1953-62; Vice-President, Selden Society 1954-86; FBA 1962; Kenan Professor of History, New York University 1967-68.
His most important works were The King's Parliament of England (1974) and his work on the modern edition of the late thirteenth-century legal treatise known as Fleta published by the Selden Society in three volumes (of a projected four).