The Czech Kings were the rulers of the historical region of Bohemia, which is now part of the modern-day Czech Republic. They played a significant role in shaping the country's history from the early Middle Ages until the end of the monarchy in the early 20th century. Notable kings include Charles IV, who was also the Holy Roman Emperor, and Wenceslas I, known for his patronage of Christianity. The monarchy in Bohemia was characterized by a series of dynasties, including the Přemyslid and Luxembourg families. The kings were often involved in regional conflicts and alliances, influencing the political landscape of Central Europe. The last king, Charles I, ruled until the monarchy was abolished in 1918.