Diessen is hypothesized to be the birthplace Deusone of the Gallic Emperor Postumus.
There has been a lot more archaeological evidence found to attest to Roman occupation in the parish, including A dispersed hoard of 300 to 400 Roman coins, mostly of Postumus, but including examples minted by Gallienus and Hostilian which were found via metal detecting in the 1980s.
Postumus |
In any event, Postumus ignored his invitation and Aureolus, unsupported by the Gallic usurper, was defeated by Gallienus in a battle on the River Adda east of Milan at a place known for centuries as Pontirolo (from Latin Pons Aureoli i.e. 'The Bridge of Aureolus').
When Ulpius Cornelius Laelianus, a high official under Postumus, declared himself emperor in Germania Superior, in the spring of 269, Postumus defeated him, but in doing so, refused to allow the sack of Mainz, which had served as Laelianus' headquarters.
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Under threat of invasion by multiple tribes, Gallienus' troubles primarily lay with Postumus, whom he could not attack because his attention was required in dealing with Macrianus and the invading "Skythai."
It supported the Gallic Empire of Postumus (260-274) and was no doubt suffered great losses when Aurelian overthrew Tetricus I in a bloody battle at the Catalaunian Fields (Châlons-en-Champagne) in 274.
The author(s) of the Historia asserts that Postumus the Younger was a skilled rhetor, and that his Controversiae were included among Quintilian's Declamationes.
A hoard of third-century Roman coins has been discovered at Velzeke, including 91 denarii (ranging in date from the reign of Septimius Severus to that of Gordian III) and 93 antoniniani (ranging in date from the reign of Elagabalus to that of Postumus).