The second Hellenistic dynasty , the Ptolemies , ruled Egypt from 305 BC until Egypt became a province of Rome in 30 BC ( whenever two dates overlap , that means there was a co-regency ) .
The second Hellenistic dynasty , the Ptolemies , ruled Egypt from 305 BC until Egypt became a province of Rome in 30 BC . If two dates overlap , that means there was a co-regency .