city
Mainz (Mogontiacum)
Mainz, Germany · North & Northeast Europe
49.999, 8.274
Attested. A late-Roman church is attested (Jerome's letter on the 406 sack). Lists of the earliest bishops are partly legendary.

Mogontiacum, capital of Upper Germany, had a Christian community and bishops by the 4th century, though the early bishop lists are partly legendary. Jerome describes the city's sack in 406, with many killed in its church. Under Boniface in the 8th century it became the leading archbishopric of Germany.
Source stance: insider. Church sources.
People and groups named here
- Boniface (8th century)
Sources
- Mainz
Catholic Encyclopedia (1907-1912), public domain; New Advent. Accessed 2026-11-11.
- Pleiades place 109169: Mogontiacum
Pleiades Gazetteer (ISAW, NYU). Accessed 2026-11-11.
Further reading
Councils here
None in this list.