τριηκόντερος

From LSJ

πείθεται πᾶς ἥδιον ἢ βιάζεται (Dio Cassius, Historiae Romanae 8.36.3) → it's always more pleasant to be persuaded than to be forced

Source

German (Pape)

ἡ, sc. ναῦς, ein dreißigruderiges Schiff, Her. 4.148, 7.97, 8.21.