Mediomatrici
Mediomatrici tribe is from Belgic Gaul region of the ancient Europe.
 

Gold 1/4 stater coin of Mediomatrici. 80-50 BCE
Obverse: Imitation of Apollo.
Reverse: Imitation of Pegasis..
Weight: ~1.9 grams. Diameter: ~15 millimeters.
Reference: Schörghuber 457