Imad ad-Din Zengi (Imanudin Zinki):

Background: Imad ad-Din Zengi was the son of Zengi and became the atabeg (governor) of Aleppo after his father's death.

Role: Imad ad-Din continued his father's efforts against the Crusaders and played a crucial role in the defense of Muslim territories. His actions laid the groundwork for later leaders like Salah ad-Din.