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**Catholic position:** Jesus Christ, specifically through his appointment of Peter as "the rock" (Matthew 16:18) and the institution of the Eucharist at the Last Supper. The Church traces its apostolic succession through the line of Bishops of Rome back to Peter.
**Historical development:** The transition from a loose network of apostolic communities to a centralized institutional church in Rome is a gradual process, not a single founding event. Key inflection points:
- **1stβ3rd c.** β Local episcopal communities; Rome gains prominence as a major see.
- **312β325 AD** β Constantine's conversion and the Council of Nicaea. The Church becomes entangled with state power.
- **4thβ5th c.** β The title *pontifex maximus* transfers from Roman priesthood to the Bishop of Rome; Latin liturgy solidifies.
- **1054** β EastβWest Schism formalizes the split with Constantinople.
- **1075** β *Dictatus Papae* under Gregory VII asserts universal jurisdiction.
So the answer depends on what you mean by "founded": the theological claim is Christ/Peter; the institutional reality is a centuries-long accretion of power, doctrine, and political alignment, with no single moment of "founding" in the way a corporation is incorporated.
