The Duke of Bavaria is a historical title associated with the rulers of the region of Bavaria in Germany. The title has its origins in the early Middle Ages and has been held by various noble families, most notably the House of Wittelsbach. The dukes played a significant role in the political and cultural development of Bavaria, influencing its history and governance. Bavaria became a kingdom in the 19th century, and the title of Duke was eventually replaced by the title of King. Today, the legacy of the dukes can be seen in the rich cultural heritage of Bavaria, including its architecture, traditions, and festivals, such as Oktoberfest.