Papal Bull Unam Sanctam- Two Swords-1302

We are told by the word of the gospel that in this His fold there are two swords,—a spiritual, namely, and a temporal. For when the apostles said "Behold here are two swords" — when, namely, the apostles were speaking in the church — the Lord did not reply that this was too much, but enough. Surely he who denies that the temporal sword is in the power of Peter wrongly interprets the word of the Lord when He says: "Put up thy sword in its scabbard." Both swords, the spiritual and the material, therefore, are in the power of the church; the one, indeed, to be wielded for the church, the other by the church; the one by the hand of the priest, the other by the hand of kings and knights, but at the will and sufferance of the priest.