In 1508 Jean Grolier was a "secrétaire du roi" ("secretary to the king" - a junior aide in today's terminology) who had to accompany Louis XII and his court around France. His studies continued under the Renaissance humanist Gaspar Argilensis (or Gaspar d'Argile), who dedicated his edition of Suetonius to Grolier (Lyons 1508). Grolier was in Milan as treasurer from 1509 (at least) until the French were expelled in June 1512, and then returned with the French army, now under François I, in 1515 and remained until they were again thrown out in 1521, after the disaster of the Battle of Pavia, when he returned to France.