The 5th century Notitia Dignitatum records eleven prefecturesThe capitals of the prefectures are called out in the locative case in the illumination portrayed in the article as: Saletione, Tabernis, Vico Iulio, Nemetis, Alta Ripa, Vangionis, Moguntiaco, Bingio, Bodobrica, Confluentibus, Antonaco, all of which are transparently cities, some of which exist today. The entries, however, are obscure, such as the entry for the Vangiones: "Praefectus militum secundae Flaviae, Vangiones." The second Flavian is probably not one of the two legions of that name, as they were stationed elsewhere. It could have been a cohors, an ala, or simply a district, the name of the prefecture. Praefectus militum, "military prefect" could have been an army officer or a governor, or both. The debate continues. in the domain (sub dispositione...) of the "Duke of Mainz" (Dux Mogontiacensis). Ruling over one of them from the castellum Vangionis (locative case of either Vangionis or Vangio) is the Praefectus militum Secundae Flaviae, Vangiones; that is, the prefect of a district called Secunda Flavia among the Vangiones. This domain includes 11 prefectures in the Rhineland and northern Alsace.
