The joint commemoration of the Apostles Peter and Paul is one of the most ancient customs of the Roman Church, attested already in the oldest surviving Roman liturgical calendar, the Depositio Martyrum, written in 336 A.D. A verse of the hymn Apostolorum passio, agreed by most authorities to be an authentic work of St Ambrose († 397), and still used in the Ambrosian liturgy, says that “the thick
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