The primary justification for the Roman bishop's leadership over the Western church was that

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The primary justification for the Roman bishop's leadership over the Western church was that they believed the apostle Peter had been the first bishop of Rome. This belief was based on a passage in the Gospel of Matthew where Jesus tells Peter that he will be the rock upon which he will build his church. The Roman bishops argued that Peter had established the church in Rome before his martyrdom, and therefore the Roman bishop held a special authority over the other bishops in the Western church.

The Primary Justification for the Roman Bishop's Leadership Over the Western