The Agnus Dei was introduced in the Mass by Pope Sergius (687-701), which may have been a defiant act against the Byzantine empire (Constantinople), who ruled that Christ shall not be depicted as an animal. The Agnus Dei, like the Credo, was one of the last things to be added to the Mass Ordinary.)
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Agnus Dei - Byrd, Mass for 4 Voices
YouTube - Pierre de La Rue - Agnus Dei
YouTube - Arvö Pärt. "Agnus Dei"
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