Bryllion
Βρύλλιον
Bryllion (Βρύλλιον: Eth. Βρυλλιανός; Steph. s. v.), a city on the Propontis in Bithynia. Stephanus reports that it was Cius, according to Ephorus, by which he probably means that Bryllium was the old name of Cius. There was a district Bryllis which contained the small town of Dascyleium. Pliny (5.32) mentions Bryllium, which he evidently takes to be a different place from Cius, but near to it.
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.