The sheet belonged to an antiphonary, a large liturgical book used by the choir for chanting. It contains all the music and texts needed for daily services in the church. In South Flanders, where this manuscript originates, the Confrérie des Charitables de Saint-Éloi has been active since 1188, when a plague wave raged in the region. This brotherhood was in charge of giving bread to the poor, caring for the sick, consoling the dying, burying the dead, and giving them a burial.