Kyrie Eleison

← Encyclopedia

Kyrie eleison is the Greek petition “Lord, have mercy,” a short cry for mercy that survives, untranslated, at the opening of the Latin Mass. Two words long in Greek — Kýrie eléēson — it is one of the very few Greek phrases the Roman liturgy never converted to Latin, and so it carries the memory of a time when the church of Rome still prayed in Greek.

The petition is older than its place in the Mass. It echoes the language of the Greek Psalms and the Gospels, where the blind and the desperate call out to be shown mercy, and it had a long life in the East before the West settled it into fixed form. In the Eastern liturgies it functions as a response: a deacon names the things to pray for, one after another, and the people answer Kyrie eleison to each — a litany, the same plea repeated until the petitions are exhausted. That responsive, list-like shape is its native home, and it is the form in which the cry seems first to have spread.

In the Western rite the litany contracted to a fixed acclamation near the start of the Mass, conventionally a ninefold pattern: Kyrie eleison three times, Christe eleison three times — “Christ, have mercy” — and Kyrie eleison three times again. Medieval interpreters read the threefold grouping as addressed to the three persons of the Trinity, though that reading is a gloss laid over the text rather than its origin. The same nine-line shape became one of the chief sites of liturgical music. In sung settings of the Mass, the Kyrie is the first movement composers met, and across the polyphonic centuries it drew some of the most elaborate writing in the repertory — a few syllables of Greek carrying music far longer than the words.

What the petition asks is plain, and it does not change across these settings: that the Lord show mercy. Christian practice has held this not as a single request answered once but as a standing posture before God, returned to at every celebration — the reason the cry is repeated rather than spoken once and left. It is penitential without being a confession of particular sins; it names the need for mercy as a condition rather than an occasion.

Historians treat the Kyrie as a clear case of how liturgy preserves its own strata. A congregation that has long since stopped speaking Greek still opens its central rite with a Greek sentence, kept because it was always kept — the phrase outlasting the language that made it ordinary. The cry goes on being said in the words in which it was first received.

→ Related: Roman Rite · Vespers · Western Monasticism