Dictionary of Greek and Roman Geography/Abbassus
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ABBASSUS or AMBASUM (Abbassus, Liv.; Ἄμβασον, Steph. B. s. v.: Eth. Ἀμβασίτης), a town of Phrygia, on the frontiers of the Tolistoboii, in Galatia. (Liv. xxxviii. 15.) It is, perhaps, the same as the Alamassus of Hierocles, and the Amadasse of the Councils. (Hierocles, p. 678, with Wesseling's note.)