Clement of Rome' First Letter, a document that has been dated from the 90s to the 120s, is one of the earliest sources adduced in support of Peter's stay in Rome, but Zwierlein questions the text's authenticity and whether it has any knowledge about Peter's life beyond what is contained in the New Testament Acts of the Apostles.  The letter also does not mention any particular place, only saying: "Peter, through unrighteous envy, endured not one or two, but numerous labours and when he had at length suffered martyrdom, departed to the place of glory due to him. " (ch. 5) A letter attributed to Ignatius of Antioch to the Romans might imply that Peter and Paul had special authority over the Roman church, telling the Roman Christians: "I do not command you, as Peter and Paul did" (ch. 4), although Zwierlein says he could be simply referring to the Epistles of the Apostles, or their mission work in the city, not a special authority given or bestowed. Zwierlein has questioned the authenticity of this document and its traditional dating to c. 105–10, who says it may date from the final decades of the 2nd century instead of from the beginning.