🗣️Old Church Slavonic

1. Introduction & status

Old Church Slavonic (OCS) is the first literary and liturgical language of the Slavs — the oldest Slavic language written down, and still the ancestor-form of the Church Slavonic used in Orthodox worship today. In its own texts it is simply called словѣньскъ ѩзꙑкъ (slověnĭskŭ językŭ), 'the Slavic language'.¹

It was standardised in 863 by the brothers Cyril and Methodius, Byzantine missionaries from Thessaloniki, for a mission to Great Moravia at the request of Duke Rastislav. They based it on the South Slavic dialect spoken in the hinterland of their home city, which is why OCS is sometimes also called Old Bulgarian or Old Macedonian.¹

For a learner, the key point is that OCS is a reading language with a religious corpus — Gospels, Psalter, prayers — and an unusually close relationship to reconstructed Proto-Slavic. If you know a modern Slavic language, a great deal of OCS will feel like an older, more heavily inflected cousin.¹

2. Historical context

After Cyril's death and the expulsion of the Byzantine mission from Moravia in 886, their students carried the new literary language south and east. Under Boris I of Bulgaria it took root at the Preslav and Ohrid literary schools, and from there OCS and its script spread across Orthodox Slavdom — to Bulgaria, Serbia, and the Rus'.¹

The earliest manuscripts (the 'canon' of OCS) date from the 10th–11th centuries. Slightly later, locally-coloured forms of the language are called Church Slavonic 'recensions' (Russian, Serbian, Bulgarian), which remain in liturgical use to this day. This guide describes the classical OCS of the canon, not the later recensions.²

3. Writing system: two alphabets

OCS was written in two successive alphabets. Cyril first devised the Glagolitic alphabet (around 863), a wholly original script whose forms are unlike any other. A generation later, at the Bulgarian schools, the Cyrillic alphabet — named in Cyril's honour but based on Greek uncial letters plus extra signs for Slavic sounds — took over and eventually prevailed.¹

Modern editions and this guide use Cyrillic. A few of its letters have no Modern English or even Modern Russian counterpart:

4. Sounds in brief

Two features define the OCS sound system. First, the jers ъ and ь were real (if very short) vowels; only later did they either drop or 'clear' to full vowels, a change that reshaped every Slavic language. Second, OCS still had the two nasal vowels ѧ (ę) and ѫ (ǫ), inherited from Proto-Slavic and since lost everywhere except Polish.¹²

Consonants show the results of the Slavic palatalisations: k, g, x alternate with č, ž, š and with c, dz, s before front vowels (as in the very name of the language). Pronunciation is reconstructed and conventional, so treat any spoken rendering as scholarly convention rather than certainty.²

5. Core vocabulary

Vocabulary is given in Cyrillic with a scholarly transliteration and the English meaning. Nouns are in the nominative singular, verbs in the infinitive.²³

Pronouns

Numbers 1–10

People and family

The natural world

The body

Common verbs and everyday words

6. Grammar in brief

OCS is even more heavily inflected than Latin. Nouns have three genders (masculine, feminine, neuter) and seven cases — nominative, genitive, dative, accusative, instrumental, locative and vocative — spread across several declension classes organised by the old stem-final sound. Pronouns and adjectives distinguish six of those cases (no separate vocative).³

Most strikingly, OCS keeps three numbers: singular, plural, and a fully living dual used whenever exactly two of something are meant — and the dual controls agreement on adjectives and verbs too, not just nouns. This is one of the first things that marks a text as genuinely early Slavic.³

Verbs already show the Slavic aspect system (a verb is broadly perfective or imperfective) and a rich set of past tenses — aorist and imperfect — alongside the present. Word order is fairly free; in the translated Gospels it often shadows the Greek original. Because so much is carried by the endings, reading OCS is largely a matter of learning to parse those endings.³

7. A sample text: the Lord's Prayer

The opening of the Lord's Prayer (Отьче нашь) in classical OCS orthography, with transliteration and translation — the single most familiar OCS passage:⁴

отьчє нашь· ижє ѥси на нєбєсѣхъ· да свѧтитъ сѧ имѧ твоѥ·

Transliterated: otĭče našĭ, iže jesi na nebesěxŭ, da svętitŭ sę imę tvoje — 'Our Father, who art in heaven, hallowed be thy name.' Read otĭče 'O father' (the vocative of otĭcĭ), iže 'who', jesi 'thou art', nebesěxŭ 'heavens' (locative plural), and imę tvoje 'thy name'.⁴

8. Learning resources

A reading-first stack:

• Horace G. Lunt, Old Church Slavonic Grammar (7th ed.)Core — The standard reference grammar in English.
• William R. Schmalstieg, An Introduction to Old Church SlavicBeginner — A widely used teaching introduction with readings.
• Wiktionary — Old Church SlavonicReference — Searchable lemmas with declensions and etymologies.
• Old Church Slavonic (Wikipedia)Overview — History, the two alphabets and phonology summarised in this guide.

Honest limitations

• OCS is a reading language known from a small religious canon; there is no conversational tradition and pronunciation is reconstructed (Medium confidence).
• Manuscripts vary: spelling differs between the Glagolitic and Cyrillic copies and between recensions, so normalised textbook forms (used here) smooth over real variation.
• Later liturgical Church Slavonic is not identical to the classical OCS described here; do not read modern service-book spellings back into the 10th–11th-century language.
• This guide is an orientation with core vocabulary and grammar in brief; full paradigms and connected reading are left to the linked grammars.