Same entry in ps.-Zonaras.
[1] The Greek name for the lower Danube; see OCD(4) p.749, s.v. Ister.
[2] Part of Menander Protector fr. 21 Blockley (192-193), on Baian (cf. alpha 209 note) crossing the Danube in order to attack Slav villages. See the following lines in this fragment at alpha 209. According to LSJ s.v. (web address 1), "double-sterned" means "with rudder behind and before"; but even if for their "rudder" we understand "pair of steering-oars" (on which see generally e.g. L. Casson, Ships and Seamanship in the Ancient World (Baltimore 1995) 224-8), this is not how ancient ships were constructed. So the present "double-sterned" vessels were perhaps like the ones which, according to Polyaenus 3.11.14, the Athenian general Chabrias (chi 1) used in the mid C4 BCE: with a second pair of steering oars, for rough water.