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'''William of Sherwood''' (or Shyreswood, Shireswood) (1190 – 1249), was a [[medieval]] [[English people|English]] [[logician]] and teacher.   

'''William of Sherwood''' (or Shyreswood, Shireswood) (1190 – 1249), was a [[medieval]] [[English people|English]] [[logician]] and teacher.   

Little is known of his life, but he is thought to have studied at the [[University of Paris]], as a master at [[Oxford]] in 1252, and that he was treasurer of [[Lincoln, Lincolnshire|Lincoln]] from 1254/8 onwards, and a [[rector]] of [[Aylesbury]].   

Little is known of his life, but he is thought to have studied at the [[University of Paris]], as a master at [[Oxford University (Medieval)|Oxford university]] in 1252, and that he was treasurer of [[Lincoln, Lincolnshire|Lincoln]] from 1254/8 onwards, and a [[rector]] of [[Aylesbury]].   

He was the author of two books which were an important influence on the development of [[Scholastic logic]]: ''Introductiones in Logicam'' (Introduction to Logic), and ''Syncategoremata''.  These are the first known works to deal in a systematic way with what is now called [[supposition theory]], known in William's time as the ''logica moderna''.

He was the author of two books which were an important influence on the development of [[Scholastic logic]]: ''Introductiones in Logicam'' (Introduction to Logic), and ''Syncategoremata''.  These are the first known works to deal in a systematic way with what is now called [[supposition theory]], known in William's time as the ''logica moderna''.