850) was a Frankish prelate and courtier, temporary bishop of Trier (812–13) and Lyon (835–38), and an accomplished liturgist.
In 831, Amalarius travelled to Rome to meet Pope Gregory IV and arrange a new Frankish liturgy.
He wrote extensively on the Mass,[3] including the Liber officialis (see plowboy trope) and the De ordine antiphonarii,[4] and was involved in the great medieval debates regarding predestination.
We must rely on his enemy, Florus of Lyon, for an account of Amalarius' condemnation on the accusation of heresy at Quierzy, 838.,[5] which banned some of his works.
Nevertheless, his writings form a good portion of our current documentation of the ninth century liturgies of the Western Church.