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 Svatopluk 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
Old Church Slavonic or Old Slavonic is the first Slavic literary language.
Old Church Slavonic
Example of the Cyrillic alphabet: excerpt from the manuscript Vidin Miscellany, written in Middle Bulgarian, 1360
A page from the Flowery Triodion (Triod' cvetnaja), a Polish book printed in Kraków in about 1491, one of the oldest printed Byzantine-Slavonic books, National Library of Poland.
A page from the Gospel of Miroslav, Serbian medieval manuscript, a 12th-century Byzantine-Slavonic book, National Library of Serbia.