Duke John IV (John IV of Brittany)

Duke John IV of Brittany (John IV) was a noble leader who ruled from 1364 to 1399. He was significant for his efforts to strengthen Brittany's independence from France during a tumultuous period marked by the Hundred Years’ War. As a strong supporter of his duchy, he worked to stabilize its economy and enhance its defenses. John IV was also known for his political alliances and for being a patron of the arts. His reign is noted for the cultural developments in Brittany and for laying the groundwork for future rulers to maintain Brittany's autonomy.