From Deadly Simple Games
PDF – Pay What You Want

Simple but not simplistic game of trireme battles during the Classical Greece period (500-336 BC).
Rules are just two pages long, but include all the features of ancient naval warfare (shooting, ramming, boarding), are fast and fun but also tactically challenging.
A small and quick naval encounter can be fought between two squadrons of eight to twelve triremes, or a bigger battle can be arranged, for a stand-alone game or as a part of a campaign.
A link to a free STL file of a 1:1200 trireme is provided in the rules.