Great Moravia was a Slavic state that existed in Central Europe during the 9th century. It encompassed parts of modern-day Czech Republic, Slovakia, and Austria. The state played a significant role in the spread of Christianity and the development of Slavic culture, particularly through the work of missionaries like Cyril and Methodius. The political structure of Great Moravia was a loose federation of tribes, with a strong emphasis on trade and cultural exchange. It reached its peak under the rule of Prince Rastislav, who sought to strengthen the state against external threats. Great Moravia eventually declined due to internal conflicts and invasions by neighboring powers.