Mattiaci
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The Mattiaci were an ancient tribe, probably of Germanic origin, located on the right side of the Rhine in the area of Wiesbaden and the Wetterau. Tacitus in his Germania (ch 29) relates that they paid tribute to the Romans.[1] They took part in the Batavian Rebellion in 69.
The Notitia Dignitatum, an early 5th century document, lists two auxilia palatina, the Mattiaci seniores and the Mattiaci iuniores.