We have seen in a passage already quoted Ch. II. § 2. that at Milan S. Ambrose expounded the Creed to Catechumens in the Baptistery.  But whatever may have been the custom in other places, it is certain from numerous passages in Cyril’s Lectures that they were delivered in the great Basilica, or Church of the Resurrection, built by Constantine on the site of the Holy Sepulchre, and consecrated, as we have seen, with great splendour in the year 335 See above, Ch. I. p. 2.  Cf. Cat. iv. 10; x. 19; xiii. 4, 22, 39; xiv. 9, 14, 22, &c..  In a passage Cat. xvi. § 4. where Cyril is speaking of the descent of the Holy Ghost on the day of Pentecost, he says, “as we discourse on Christ and Golgotha here in Golgotha, so it were most fitting that we should also speak concerning the Holy Ghost in the Upper Church; yet since He who descended there jointly partakes of the glory of Him who was crucified here, we here speak concerning Him also who descended there.”  It appears from a passage in the Introductory Lecture Procat. § 4. that it was delivered in the Church itself before the whole congregation, after that portion of the daily Service to which Catechumens were usually admitted:  “Dost thou behold this venerable constitution of the Church?  Dost thou view her order and discipline, the reading of Scripture, the presence of the Ordained, the course of instruction?”  The same custom was retained in Jerusalem in the time of John, Cyril’s successor in the Bishopric, who in writing to Jerome says, “The custom with us is that we deliver the doctrine of the Holy Trinity publicly during forty days to those who are to be baptized Hieron. Ep. 61 (al. 38).  The passage is quoted more fully below on p. xliv..”