Jacques Coeur

Jacques Coeur (1400-56). Brokgauz-Efron says that Coeur was an alchemist who circulated counterfiet gold and money with King Charles VII (1403-61). He was accused of poisoning Agnes Sorel (the king's mistress) and of treason, though he may have been guilty of neither. Several of the criminals in Chapter 23 are falsely accused.

See Jacques Coeur at the Bourges Page (in French)

There is apparently now a famous restaurant and hotel school named after him!