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San Marino claims to be the oldest constitutional republic in the world, founded on 3 September 301, by Marinus of Rab, a Christian stonemason fleeing the religious persecution of Roman Emperor Diocletian.
In the Orthodox Church however his feast day is observed on March 13, and according to an epistle of Saint Dionysius, Bishop of Corinth, he is placed as the successor of Saint Narcissus of Athens, dating his martyrdom to the period of the persecution under Marcus Aurelius (161-180).