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Rostislav was a prince of Great Moravia in the 9th century. He ruled from 846 to 870 and is known for consolidating the country and defending it against the East Frankish empire. Dissatisfied with the Latin-speaking clergy, Rostislav requested missionaries from the Byzantine emperor Michael III. In response, the Byzantine missionaries Saints Cyril and Methodius arrived in 863. They preached in the Slavic language, translated religious texts, and developed the Glagolitic alphabet, which led to the creation of the Cyrillic alphabet.123

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