The Decline of the Crusaders Episode 2 "The Rise of Nur ad-Din"

In this episode, we hear about the rise of the Crusaders' new enemy, Nur ad-Din, meaning "Light of the Faith" in Arabic. Nur ad-Din was the son of Zengi, who had united the Emirates of Mosul and Aleppo, and captured the Crusader city of Edessa, which had in turn caused the Second Crusade. Nur ad-Din's reign marked another step towards the unification of Islam against the Crusaders.