Cantors made unparalleled contributions to the way time was understood and history was remembered in the medieval Latin West. The men and women who held this office in cathedrals and monasteries were responsible for calculating the date of Easter and the feasts dependent on it, for formulating liturgical celebrations season by season, managing the library and preparing manuscripts and other sources necessary to sustain the liturgical framework of time, and promoting the cults of saints. Crucially, their duties also often included committing the past to writing, from simple annals and...