Succi
Eth. Succi or SUCCORUM ANGUSTIAE, the principal pass of Mount Haemus in Thrace, between Philippopolis and Serdica, with a town of the same name. (Amm. Marc. 21.10.2, 22.2.2, 26.10.4.) It is called Σοῦκις by Sozomenus (2.22), and Σουσάκεες by Nicephorus (ix 13). Now the pass of Ssulu Derbend or Demir Kapi (Comp. V. Hammer, Gesch. des Osman. Reichs, i. p. 175.)
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.