Tatwine or Tatwin ( Tatuini or Tadwinus ; c . 670 – 734 ) was the tenth Archbishop of Canterbury from 731 to 734 . Prior to becoming archbishop , he was a monk and abbot of a Benedictine monastery . Besides his ecclesiastical career , Tatwine was a writer , and riddles he composed survive . Another work he composed was on the grammar of the Latin language , which was aimed at advanced students of that language . He was subsequently considered a saint .