Jesus was referring to this fisherman when he said, "Upon this rock I will build my church"
[DOC] [TLE] Upon This Rock | Keep Believing Ministries [PAR] Aug 27, 1989 ... And the keys of the kingdom that Jesus talks about in verse 19 refer to the ... 
Second, when Jesus said, Upon this rock I will build my church, he said ... men, 
those fishermen, those tax collectors, those political rabble-rousers,... [DOC] [TLE] Peter and the Papacy | Catholic Answers [PAR] Indeed, why call Simon the fisherman "Rock"?