Cyril and Methodius
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Cyril and Methodius were brothers, Byzantine Christian theologians and missionaries. For their work evangelizing the Early Slavs, they are known as the "Apostles to the Slavs".
"Saints Cyril and Methodius holding the Cyrillic alphabet," a mural by Bulgarian iconographer Z. Zograf, 1848, Troyan Monastery
Cyril and Methodius, painting by Jan Matejko, 1885
Saints Cyril and Methodius in Rome. Fresco in San Clemente.
The Baška tablet is an early example of the Glagolitic from Croatia.
Svatopluk I of Moravia
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Svatopluk I or Svätopluk I, also known as Svatopluk the Great, was a ruler of Great Moravia, which attained its maximum territorial expansion during his reign.
Statue of Svätopluk on Bratislava Castle, Slovakia
Statue of Svatopluk I in Loštice, Czech Republic
The ruins of a Moravian fort on Kostolec Hill at Ducové (Slovakia)
The papal letter Scire vos volumus, written in 879 by Pope John VIII to Svatopluk I