Where were two brothers sent to Moravia to help the people?

The two brothers, Saints Cyril and Methodius, were sent to Moravia in the 9th century to assist the Slavic people in their spiritual and cultural development. They aimed to create a written system for the Slavic language, which led to the development of the Glagolitic alphabet. Their mission was to promote Christianity and education among the Slavic populations, significantly influencing the region's cultural identity.