I learned today, in my reading of random things, that the official name of the Roman short sword you’ve seen in every movie about the Roman army ever is the gladius Hispaniensis. I’m a native French speaker; I have a pretty good grasp of Latin etymology.* And I know — and so should you if you paid attention to any colonial Caribbean history in school — the root of the word Hispaniensis.
So, as I am wont to do, I went digging.
It seems that while it was developed on the Iberian peninsula, the strength (iron) and efficacy of the sword made it so popular that it was already in use by a large swath of the Rome’s armies by 200 BCE. Because of it’s durability and ability to be used both to stab, and in the right hands, to lop heads off — or limbs, whatever — the gladius Hispaniensis‘ design remain unchanged for the duration of the two hundred years it was in fashion as a Roman weapon.
*Greek, not so much.