The collapse of the Bronze Age in Palestine led the southern Semites southwards , where they reached the highlands of Yemen after 20th century BC .
Their relatives , the Amorites , followed them and settled Syria before 2500 BC .
The collapse of the Bronze Age in Palestine led the southern Semites southwards , where relatives reached the highlands of Yemen after 20th century BC .
Their relatives , the Amorites , followed them and settled Syria before 2500 BC .