Glagolitic script
Traditional 855 date for Constantine-Cyril's creation of Glagolitic
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Where 855 comes from
The later treatise On the Letters assigns the creation of the Slavic alphabet to Constantine-Cyril and, under one interpretation of its chronological system, dates it to 855.
That rests on a later textual tradition and a disputed conversion of its dating era; some scholars read the same chronology as 863.
No contemporary source records a particular creation day.
Glagolitic, not Cyrillic
The alphabet credited to Constantine was Glagolitic, the oldest known Slavic alphabet, designed to represent Slavic sounds. It is not the later script conventionally called Cyrillic.
On the Letters counts 38 letters — enough for sounds that ordinary Greek and Latin spelling handled poorly.
Its original form must be reconstructed, because the earliest surviving manuscripts are considerably later.
What the brothers actually made
The early texts principally credit Constantine with constructing the alphabet. How far Methodius was involved in designing the letterforms is not known, though he collaborated in the broader translation and missionary programme.
What they produced was a script and a literary translation language developed from Slavic speech, not a Slavic language.
Scholars also disagree over whether Constantine devised the script years before Rastislav's request or shortly before the mission left Constantinople; the first well-supported public deployment came in 863, when the missionaries reached Great Moravia with Slavonic liturgical books.
Sources
Researched 23 Aug 2026 4 sources not yet audited Traditional date
How this was checked
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Traditional date. This date is the conventional one, not one fixed by a contemporary record.
What the sources leave uncertain
- The year 855 rests on a later textual tradition and a disputed conversion of its dating era; some scholars read the relevant chronology as 863.
- Glagolitic’s original form must be reconstructed because the earliest surviving manuscripts are considerably later.
- The degree of Methodius’s involvement in designing the letterforms is not known, although he collaborated in the broader translation and missionary program.