We begin the month of December with the commemoration of a saintly bishop, Mac Cainne (Mac Coinne) who is also associated with a locality in the calendars. The Martyrology of Donegal records:
1. F. KALENDIS DECEMBRIS. 1.
Bishop MAC CAINNE, of Ath-da-laarg, by the side of Cenannus.
1. F. KALENDIS DECEMBRIS. 1.
Bishop MAC CAINNE, of Ath-da-laarg, by the side of Cenannus.
The Martyrology of Gorman, in its entry for the day records 'the great bishop Mac Cainne' with a footnote adding 'from Áth da laarg beside Cenannus'.
The earlier Martyrology of Oengus locates our bishop at 'Áth dá loarc beside Kells', which places him in County Meath.