Jan Moretus, also John Moerentorf or Joannes Moretus, was a Flemish printer who was an apprentice for Christophe Plantin, married his daughter, and later inherited the printing business on his father-
Printer's mark of Jan I Moretus, found in Henricus Sedvlius, Præscriptiones adversvs hæreses (1606), Openbare Bibliotheek Brugge 1875a (f. *1 recto)