The Romans have never made such intensive use of heavy galleys as the other Mediterranean powers.
The Roman Fleet traditionally consisted of four types of major units, the smallest being special, the so-called "naval dust", the light Tricontères, Dicontères and Pentacontères de liaison. As units of shock, one found the Biremes, Trierèmes, Quadrirèmes. The Quinqueremes, very heavy, were also engaged in large numbers as liners. There appear to have been no other types of heavy units apart from Admiralty vessels, rare Octeres and Decères (not Romanized in "Decirémus" for example, as this type of ship had Hellene connotation). The latter possessed ten rowers per sail in principle, distributed over three rows of rowing, namely four at the top and three at the other two.
It seems hardly conceivable that there would have been four-row superimposed units. It is also quite possible that there were only two rows of oars, but largely separated and served by 6 Thranites and 4 Zygites. The height of Marc-Antoine's Decere was elevated according to the writings, since its freeboard was twice that of a trire, and therefore a little more than six meters. The Romans never liked the classic naval tactics (Diekplous, Perpetous ...), and rostrum charges against rostrum, preferring maneuverable units to encircle the opponent and upgrade him in an infantry fight. Thus, after their adoption of the Hemioliae and Liburnes, the Quinqueremes and a fortiori the ships of a higher class were relegated as ships of command, before being definitively abandoned.