Ancient Warships...Roman/Greek/Carthaginian...?

[Flavivs Aetivs]

anything larger than a monoreme or Bireme had died out in the 2nd-3rd century.

Triremes were still in use in AD323, when Licinius' admiral used several hundred of them against Constantine's fleet in the battle of the Hellespont. Constantine (or his son Crispus) defeated them using lighter vessels called 'triaconters', but the term is quite obscure. Possibly this '30 oared' ship might have been the ancestor of the later dromon?

If I may bring this thread up again...

I did some research online, and it looks like that the "Triaconter" which was a late Roman Liburnian Monoreme (It couldn't have been a trireme, too small in comparison to a Licinian ship), was very similar to the later Dromons used by Belisarius. By this point we know the Romans were using Lateen sails, especially on their galley fleet, and evidence from the Vergillian manuscripts points to the use of Above-Water spurs instead of Rams in the 4th century.

Therefore, the only real difference between these Liburnian-type warships and Dromons was the adoption of a Full Deck, the rudder configuration, forecastle/siphon, and of course the Dromon was larger.