Ptolemais is what remains of the ancient city region of Cyrenaica. It is located between what is now modern Benghazi and Susah, Libya. Founded in the 3rd century BC, Ptolemais was named after Ptolemy III (from the Ptolemic dynasty in Egypt), with the intended use of becoming a trading hub. The city flourished through the period of Roman rule and up to the Arab conquest in AD 642. Little occupation has continued thereafter; Ptolemais has since been a historical site of Libya’s ancient history.