Amalarius of Metz was a 9th-century Frankish prelate, poet, and courtier who served as a high-ranking official under Charlemagne and Louis the Pious. He held significant ecclesiastical positions, including serving as the archbishop of Trier and the bishop of Lyon. As a prominent liturgist, he was deeply involved in the development of Western Church rituals. His career was marked by diplomatic missions to Constantinople and significant theological involvement during the Carolingian era.