Roman Martyrologium

A martyrology is a catalogue or list of martyrs and other saints and beati arranged in the calendar order of their anniversaries or feasts. Local martyrologies record exclusively the custom of a particular Church. Local lists were enriched by names borrowed from neighbouring churches. Consolidation occurred, by the combination of several local martyrologies, with or without borrowings from literary sources.

This is the now accepted meaning in the Latin Church. In the Orthodox Church, the nearest equivalent to the martyrology is the Synaxarion and the longer Menologion. As regards form, one should distinguish between simple martyrologies that simply enumerate names, and historical martyrologies, which also include stories or biographical details; for the latter, the term passionary is also used.

The martyrology, or ferial, of the Roman Church in the middle of the fourth century still exists. It comprises two distinct lists, the Depositio martyrum and the Depositio episcoporum, lists most frequently found united.

Among the Roman martyrs, mention is already made in the Ferial of some African martyrs (March 7, Perpetua and Felicitas; September 14, Cyprian). The calendar of Carthage, which belongs to the sixth century, contains a larger portion of foreign martyrs and even of confessors not belonging to that Church.

The most influential of the local martyrologies is the martyrology commonly called Hieronymian, because it is (pseudepigraphically) attributed to St. Jerome. It was presumably drawn up in Italy in the second half of the fifth century, and underwent recension in Gaul, probably at Auxerre, in the late sixth. All known manuscripts of the text spring from this Gallican recension.

...
Wikipedia