Rastislav

Rastislav or Rostislav (Latin: Rastiz; Greek: Ῥασισθλάβος, romanized: Rhasisthlábos) was the second known ruler of Moravia (846–870). Although he started his reign as vassal to Louis the German, the king of East Francia, he consolidated his rule to the extent that after 855 he was able to repel a series of Frankish attacks. Upon his initiative, brothers Cyril and Methodius, sent by the Byzantine Emperor Michael III in 863, translated the most important Christian liturgical books into Slavonic.