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Visit Philippi, where Paul, intending to find a place to pray by the riverside, spoke to women who had gathered there, among whom was Lydia, the seller of purple and whose heart the Lord opened to hear the words that he spoke. Lydia was the first Christian to be baptized on European soil. Visit the place where this event is remembered and see a crypt dating from the Roman period, which is thought to have served as a prison for the Apostle Paul. See the famous agora, the basilica, and the theater.