The Conquests of Islam

S1, E8: "While the Roman Empire declines, the Emperor Constantine has converted to Catholicism and founds the city of Constantinople. Justinian, who succeeds him, continues the policy of grandeur and of reconquest, and at the same time the war with Persia begins. After all the opulence and splendor, there finally remains only an exhausted population, the 'Cathedral of Saint Sophie' and the Justinian Code. Close by, another great empire, that of the Persian Sassanids, is conducting itself in the same way. Hardly has Khosroes II regained the throne, when he starts up again the exhausting war against Byzantium. In the void and desolation that follows, there soon appears a third aggressor. A small tribe of nomads - among whom are our friends - is being attacked by a group of desert pillagers. A man on a camel with long hair comes along just in time to help them…"