古代教会スラヴ語
Proglas (Old Church Slavonic Glagolitic ⰒⰓⰑⰃⰎⰀⰔⰟ, Cyrillic Прогласъ; meaning "Foreword") is the foreword to the Old Church Slavonic translation of the four Gospels. It was written by Saint Cyril in 863–867 in Great Moravia (present day Moravia and Slovakia). Proglas is considered to be the first poem in literary Old Church Slavonic.