Ptolemais is the Ancient name for several cities in the Mediterranean region:
Ptolemais (Cyrenaica), a city in the Pentapolis of Cyrenaica;
Ptolemais Ace (modern Akko), a city in the province of Syria;
Ptolemais Hermiou, a city in Egypt; and
Ptolemais Theron, a city founded on the coast of the Red Sea.
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The port city of Ptolemais was located on a promontory at the northern end of the bay across from Mount Carmel.
Under the Romans the natural harbor in the southern part of the city was improved and a breakwater was constructed, transforming it the main port on the eastern Mediterranean coast.
Ptolemais plays only a small role in the Biblical narrative: Christianity quickly won adherents among the city's foreign population.