_Irenaeus_, St., his remarks on the Incarnation, 179 referred to as defining the Church, 223 describes the Church's unity, 224 and terms it Catholic, 236 and explains the term, 237 sets forth tradition and the chiefship of the Roman Church, 239 states the principle of tradition as guarding the faith, 276. _Isidore_, St., declares that whoever does not obey Peter is a schismatic, 113. J. _James_, St., the martyrdom of, how mentioned by S. Luke, 151. _Jerome_, St., puts the safety of the Church in the bishop, 45 makes the Primacy to be instituted against schism, 78 says, it is not a church which has no priest, 135 ascribes the decision of the Council of Jerusalem to St. Peter, 150 and makes St. Paul's visit to Peter a token of his Primacy, 165, 171 gives the reasons of those who denied it to be St. Peter who was censured, 173 describes the necessity of adhering to Peter's See, 218, 239, note 120 referred to as defining the Church, 223 distinguishes it as Catholic, 236 referred to, 242 referred to on principle of tradition, 275. _John_, St., his sphere distinguished from that of Peter, 91 how often mentioned in the New Testament. 93 with his brother called Boanerges, 8, note, 86 makes himself subordinate to Peter, 128, 135, 137. _Judah_, among his brethren, a type of Peter among the Apostles, 206, 214-5. _Julian_, the apostate, distorts Paul's censure of Peter, 172. _Jurisdiction_, spiritual, derived from the person of Christ to St. Peter, 99, 107, 109 creation of, precedes the formation of the Church, 105, 107. _Jurien_, referred to, 232. _Justinian_, the Emperor, referred to, 238. K. _King_, on the Creed, referred to, 236. L. _Lactantius_, describes necessity of belonging to the Church, 231. _Leander_, referred to, 238. _Leo St._, Pope 440-461 paraphrases the name of Peter, 11 states his Primacy and association with Christ, 14 explains why our Lord prays specially for Peter, 50 says that Peter, rules all by immediate commission, 80, 168 that Christ gave to the rest through Peter, 100 that he assumed Peter into the participation of His indivisible unity, 110 remarks on the unity produced by the Incarnation, 180 describes the unity of the Catholic Episcopate as knitted up in the See of St. Peter, 242. _Leontius_, referred to, 275. _Luke_, St., his purpose in writing the Acts, 114 part which he assigns to Peter, in general, 117-122 in particulars, 122-153 slightly mentions the other Apostles, 120 exhibits Peter's miracles as John does those of Christ, 131 makes him the main figure in the Apostolic college, 133. _Lutherans_, their proofs for the real presence compared with those of Catholics for the Primacy, 259. M. _Mamachi_, his works referred to, 255. _Maximus_, St., of Turin, says that Christ gave to Peter His own title, the Rock, 15 sets forth Peter's Primacy, 112. _Maximus_, martyr, referred to, 242.