What is "tatwine"

Tatwine or Tatwin (Tatuini or ; 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.