In Galarian, the name "Marshtomp" recalls nothing more impressive than the marshes where they once frolicked in mud, for the Anglo-Saxons never saw anything impressive or admirable in these pokemon. And indeed, there is little impressive about the Marshtomp once found in Galar's marshes; they are diminutive compared to their continental counterparts and easy prey for the many grass pokemon who roam Galar's many fields.
But the Marshtomp of the Tiber surely inspired something in the early Latins. Perhaps it was their aggressive nature, perhaps their tenacity in combat: some have even speculated that Latin Marshtomp, in this harsh environment being swiftly lost to man, formed schools which engaged in pitched battles over scarce territory. Regardless of the reason, in Latin, the name "Marshtomp" instead brings up thoughts of Mars, the Roman god of war named after this pokemon.
In early Roman art, Mars was even portrayed as a Marshtomp, but as Greek influence grew his portrayal was increasingly humanized, an orange fin on his helmet and his name all that recalled his origins. In time, the fins migrated from the helmet of their protective war god to the helmets of the ordinary soldier, who began wearing them in emulation of their deity: it is this fin which gives Roman helmets their distinctive shape.
The Tiber Marshtomp themselves soon disappeared from the wilderness, captured en masse and organized into sacred pokemon legions: as the empire expanded, most of Europe's Marshtomp met the same fate. Sadly, they were reviled by the early Christians as a pagan symbol and by Rome's many conquerors as one of national resistance. They did not survive into the Medieval period: it is in Hoenn, not in Europe, where we find the last of the Marshtomp.