The idea of Polemius Silvius in making the 22nd February into a commemoration of St Peter and St Paul found no imitators, but the custom of celebrating instead the _Cathedra Petri_ on this day became general in the Gallican liturgies. The significance of this feast is expressed in the words of the collect for the day: “God who on this day hast given Blessed Peter to be head after Thee to the Church” (_Deus qui hodierna die B. Petrum post te dedisti caput ecclesiæ_); _i.e._ the occasion of the feast was not the foundation or organisation of one particular church, either Rome or Antioch, but the appointment of St Peter to be head of the whole Church in general, or, in other words, the bestowal of the Primacy upon him, or his ordination as bishop (_natale episcopatus_), as others prefer to have it.[656] In this connection it must be borne in mind that, in antiquity, it was already the custom to celebrate the anniversary of the bishop’s consecration, and that special masses exist in the old sacramentaries, and among the sermons of St Leo the Great there are some for such occasions. From the fourth to the ninth century, we find this feast of the 22nd February (Cathedra Petri), without further specification, in the greater number of calendars and martyrologies, especially in those of Gaul. As the latest which give only one feast of this name, we may mention the martyrology of Wandlebert, the Calendar of Corbie of 826 in d’Achery,[657] and also the Gothic Calendar. Nevertheless, there are some Frankish calendars which contain no feast of this name, as, for example, that of St Geneviève, published by Fronteau, and the Calendar of Charlemagne. It is not in the _Neapolitanum_, nor in certain lectionaries of the same period, such as the _Comes Albini_, the lectionary of Spires, and, finally, the Roman sacramentaries.[658] It is remarkable that neither the _Gelasianum_ nor the _Gregorianum_ have a feast of St Peter’s Chair, yet it is certain that the feast was known in Rome in the fourth century, for the chronographer, referred to on page 295_n._, in his _Depositio Martyrum_ sets down: “VIII. Kal. Martias, Natale Petri de Cathedra.”