The 29th June, the commemoration of the martyrdom of the two chief apostles, is the only feast of apostles that is still observed as a public holiday. It can be regarded under two aspects as a universal and as a local festival. It is important as a local festival, because, since a constant tradition maintained that St Peter and St Paul were put to death in Rome under Nero on the same day, it is only natural that this day should be kept in Rome as the _dies natalis ss. apostolorum_, in the customary manner from the first, and so was never forgotten. But even in other localities, apart from Roman influence and tradition, we find efforts made in antiquity to devote a day to the commemoration of these same two apostles. This is proved by the fact that in the Arian martyrology in use in the East, it had already a place, on the 28th December, after St Stephen and the apostles St James and St John. This is by no means an isolated phenomenon, for in the Armenian calendar it has a corresponding place, _i.e._, on the 27th December, while in the Nestorian calendar it appears on the second Friday after Epiphany.[603] In Cappadocia, or at least in Nyssa, we find the Christmas season again considered to be the suitable time for a collective feast of the apostles, for the commemoration of the apostles Peter, James, John and Paul follows the Feast of St Stephen.[604] Even in the upper valley of the Rhone, it was felt necessary to observe the day of the death of the two chief apostles, for the calendar of Polemius Silvius, which belongs to this region, contains the entry: _depositio ss. Petri et Pauli_, but on the 22nd February, the day on which in other parts of Gaul the Feast of St Peter’s Chair was celebrated. That this calendar gives no feast of any sort on the 29th June, shows that in his choice of the day, Polemius was quite independent of the Roman tradition. The considerations which weighed with him in so doing will be explained further on. In other parts of Italy, the true day of the apostle’s death was well known, and observed, as for example, at Milan in the time of St Ambrose.[605] Among the sermons of Maximus of Turin, belonging to the fifth century, we find no fewer than ten[606] for this feast. The sermons of St Augustine, among which are five for this festival, show that in North Africa the day was kept as a holy day; he speaks of it as a _dies festus_ and a _sollemnitas_.[607] Moreover St Augustine belongs to the number of those Fathers who expressly state that although both apostles died on the same day of the month, they died in different years,[608] a fact which the historical and biblical science of the day persistently overlooks, which naturally must cause serious misgivings as to the reliability of the principles on which its chronology is constructed.