Postumus, independent emperor in Gaul from about…
December 268 CE
Postumus, independent emperor in Gaul from about 258, has successfully defended the Rhine frontier and withstood Gallienus' attempts to recover Gaul.
Having declined to support the usurper Aureolus in any way, he must now deal with a rebel on his own side, Laelianus, one of his most senior military leaders, who is hailed emperor at Moguntiacum (present Mainz, Germany) by the local garrison as well as by other troops of the area.
Close by at Augusta Treverorum, Postumus acts immediately.