Forge

[Endoperez]

I'm not quite sure if Marverni -> Marignon works, but Marignon (a nation of MA) has halberds, pikes and greatswords - those would be the Irish Longspears and Scottish Claymore.

Rome was in Italy precisely because the technology already existed.

Also, "a determined effort to improve a nation via the application of technology and infrastructure" doesn't mean magic. If Romans decided to invest on technology (as they did), they might have gotten swords of sligthly different design better suited for formations, or better armors, or better helmets, or perhaps may have come up with a more effective way of making armor. This took more than few years, though. Even a decade would really push it, and your Forge would produce wonders in very, very short time. Claymores weren't invented in 6 months, and a Forge shouldn't take longer to build than a castle...