Heraclea Pontica founded

557 BCE.

Shown on the map at 41.285°, 31.415°.

Heraclea Pontica (; Ancient Greek: Ἡράκλεια Ποντική, romanized: Hērákleia Pontikḗ; Attic Greek: [hɛːrákleːa pontikɛ́ː], Koine Greek: [(h)e̝ˈraklia pontiˈke̝]), known in Byzantine and later times as Pontoheraclea (Greek: Ποντοηράκλεια, romanized: Pontohērakleia), was an ancient city on the coast of Bithynia in Asia Minor, at the mouth of the river Lycus. The site is now the location of the modern city Karadeniz Ereğli, in the Zonguldak Province of Turkey.

Text from the Wikipedia article Heraclea Pontica, licensed CC BY-SA 4.0.

Everything else in 557 BCE