The reference in §22 to “the Council which sat first at Seleucia…and afterwards at this mighty city,” leaves no room for doubting that the Oration was delivered at Constantinople.  Further local colour is found in the allusions of §5.  We are assured by the panegyric on S. Cyprian (Orat. xxiv. 1) that it was already the custom of the Church of Constantinople to observe annual festivals in honour of the Saints:  and at present two days are kept by the Eastern Church, viz., Jan. 18th, as the day of the actual death of S. Athanasius, and May 2d, in memory of the translation of his remains to the church of S. Sophia at Constantinople.  Probably, therefore, this Oration was delivered on the former day, on which Assemani holds that S. Athanasius died.  Papebroke and (with some hesitation) Dr. Bright pronounce in favour of May 2d.  Tillemont supposes that a.d. 379 is the year of its delivery; in which case it must have been very shortly after S. Gregory’s arrival in the city.  Since, however, no allusion is made to this, it seems, on the whole, more likely that it should be assigned to a.d. 380.  The sermon takes high rank, even among S. Gregory’s discourses, as the model of an ecclesiastical panegyric.  It lacks, however, the charm of personal affection and intimate acquaintance with the inner life, which is characteristic of the orations concerned with his own relatives and friends.