There is the Church

Sisto-V Grottammare“Where Peter (or his successor) is, there is the Church.”

(Source: St. Ambrose, Commentary on Twelve of David’s Psalms, XL:30; JUR, vol. 2:1261, (quoted in Apostolic Digest, by Michael Malone, Book 4: “The Book of Christians”, Chapter 4: “There is No Allegiance to Christ Without Submission to the Pope”))