This is a coin belonging to Philip II of Burgundy at the very end of the century. (hurriedly checks facts and discovers, thanks to Professor Wikipedia, that Philip II of Burgundy was born where? WHAT a coincidence.
This is a map of Calais, slightly too late for my purposes, in two senses, but fascinating, nonetheless. It shows what was once called Newnham, now called Nieulay, as the fort to the south of the town where they had the sluice gates. If they shut them, then the river would flood the marshes and no one could come anywhere near the walls of the town itself. Cunning, non?