Gauthier-sans-Avoir is the lord of Poissy. As his name suggests, this knight has no great seigniorial duties, which pushes him to participate in the crusades. He led part of the popular crusade which was massacred before reaching Constantinople. Most of his companions were killed before reaching Byzantium and he himself perished in an ambush by the Turks near Nicaea.
If the Polish canon (member of the clergy) Copernic began studying art, medicine and studied economics, he was passionate about astronomy, which he studied at the University of Bologna. Back in Poland, he remains a canon but devotes himself in parallel to this science. He discovers that, contrary to