Strabo (Geography vii 4.3, xi. 2.5), Polybius, (Histories 4.39.4), and Ptolemy (Geographia. II, v 9.5) refer variously to the Strait of Kerch as the Κιμμερικὸς Βόσπορος (Kimmerikos Bosporos, romanized spelling: Bosporus Cimmerius), its easternmost part as the Κιμμέριον Ἄκρον (Kimmerion Akron, Roman name: Promontorium Cimmerium), as well as to the city of Cimmerium and thence the name of the Kingdom of the Cimmerian Bosporus (Κιμμερικοῦ Βοσπόρου).
Strabo (Geography vii 43 xi 25) Polybius (Histories 4394) and Ptolemy (Geographia II v 95) refer variously to the Strait of Kerch as the Κιμμερικὸς Βόσπορος (Kimmerikos Bosporos romanized spelling Bosporus Cimmerius) its easternmost part as the Κιμμέριον Ἄκρον (Kimmerion Akron Roman name Promontorium Cimmerium) as well as to the city of Cimmerium and thence the name of the Kingdom of the Cimmerian Bosporus (Κιμμερικοῦ Βοσπόρου)