Jehan Yperman
Jan or Johan or Jehan Yperman (c. 1260 – c. 1331) was a Flemish surgeon and the first medical writer in Dutch. Yperman may have studied in Paris under Lanfranco da Milano, since he often mentions him in his writings.
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Wikipedia
Jan or Johan or Jehan Yperman (c. 1260 – c. 1331) was a Flemish surgeon and the first medical writer in Dutch. Yperman may have studied in Paris under Lanfranco da Milano, since he often mentions him in his writings.