Born in 1543, Jan Moretus (né Moerentorf) would apprentice under Christophe Plantin from the age of 14. He married the latter daughter, Martine, years before inheriting his then father-in-law’s printshop.
Plantin trusted Moretus so much that he left him as the sole heir to his business - even despite his own blood relatives’ claim. His own words, in a letter written to Gabriel de Çayas, the secretary of the Spanish King:
