False. He is remembered for created glagolitic letters.
Explanation:
- Cyril and Methodius were brothers of Thessaloniki who spread Christianity and literacy in the territory of the Great Moravian Principality and Pannonia.
- They were born in Thessaloniki (Cyril was born in 827 or 828, and Methodius was born in 815 or 820). Their contribution to the cultural progress of the Slavs is significant. The first Slovene letter, named Glagolitic, was made by Cyril and Methodius.
- Their successors in the Enlightenment work were their students, who devotedly continued their activities in the field of Enlightenment.
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