The House of Brittany was a noble family that ruled the region of Brittany in northwestern France. It emerged in the 9th century and played a significant role in the political landscape of medieval France. The house produced several notable dukes, including Duke John IV, who was instrumental in maintaining Brittany's autonomy. Throughout its history, the House of Brittany was involved in various conflicts, including the Hundred Years' War. The house eventually merged with the French crown when Anne of Brittany married two successive French kings, solidifying Brittany's integration into the Kingdom of France by the early 16th century.