Gelasian Sacramentary

The so-called Gelasian Sacramentary (Latin: Sacramentarium Gelasianum) is a book of Christian liturgy, containing the priest's part in celebrating the Eucharist.

The book exists in several manuscripts, the oldest of which is an 8th-century manuscript in the Vatican Library, acquired from the library of Queen Christina of Sweden (thus MS Reginensis 316); in German scholarship this is referred to as the Altgelasianum, and is considered the sacramentary used by Saint Boniface in his mid-8th century mission on the European continent.

[2] The dating of the liturgical contents are not based on characteristics of the surviving manuscript itself (ca 750): most of its liturgy reflects the mix of Roman and Gallican practice inherited from the Merovingian church.

The spurious ascription to Gelasius gave an added authority to the contents, which are an important document of pre-Gregorian liturgy.

In 785-86, the pope sent the emperor the Sacramentarium Hadrianum, a version of the Gregorian Sacramentary for papal use, which was adapted for the Carolingian empire.