An old Roman ampitheater

While in Alexandria we also got to see a really awesome old Roman amphitheater. Of course it was in ruins. But the date outside the gates said 817 B.C. That is super old! Of course this is where not only did they have theater but they also held political rallies and did awful gladiator type stuff too. Though I never really figured out what a ROMAN amphitheater is doing in EGYPT?