The Great Moravian Empire was a significant early medieval state in Central Europe, existing from the 9th to the early 10th century. It encompassed parts of modern-day Czech Republic, Slovakia, and Hungary. The empire was known for its cultural and political influence, particularly in the spread of Christianity and the development of Slavic literacy. Under the leadership of rulers like Rastislav and Svatopluk, the Great Moravian Empire became a center for trade and cultural exchange. It played a crucial role in the missionary work of the brothers Cyril and Methodius, who created the Glagolitic alphabet, laying the foundation for Slavic written culture.