Apr 03rd - Sixtus I (Xystus)

Little is known about the life of seventh pope. We do know that several liturgy traditions which we still practice today were instituted by him. He decreed that only priests may touch the sacred vessels, that the whole congregation, including the priest should recite the Sanctus prayer during the Mass (a practice in the East, but not common in the West), and that bishops returning from the Apostolic See to their dioceses must present Apostolic letters as proof that they are still the bishop after visiting the pope - which I guess was a problem. Martyred during the persecutions of the Roman emperor Trajan.

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First of all, then, I ask that supplications, prayers, petitions, and thanksgivings be offered for everyone, for kings and for all in authority, that we may lead a quiet and tranquil life in all devotion and dignity. This is good and pleasing to God our savior, who wills everyone to be saved and to come to knowledge of the truth. For there is one God. There is also one mediator between God and the human race, Christ Jesus, himself human, who gave himself as ransom for all. This was the testimony at the proper time.

-- 1 Timothy 2:1-7