Prince Rastislav was a significant figure in the history of the Great Moravian Empire during the 9th century. He ruled from around 846 to 870 and is known for his efforts to strengthen the political and cultural unity of the Slavic peoples in the region. Rastislav sought to establish an independent church and invited the Byzantine brothers Cyril and Methodius to spread Christianity and literacy among the Slavs. Under Rastislav's leadership, the Great Moravian Empire expanded its influence and became a center for Slavic culture and education. His reign marked a crucial period in the development of Slavic identity and the promotion of the Old Church Slavonic language, which played a vital role in the region's religious and cultural life.