What is "gokbori"

Gökböri (also rendered Gokbori, Kukburi and Kukuburi), or Muzaffar ad-Din Gökböri (full praise names: al-Malik al-Muazzam (the Exalted Prince) Muzaffar ad-Din (the Triumphant in the Faith)), was a leading emir and general of Sultan Saladin (Ṣalāḥ ad-Dīn Yūsuf ibn Ayyūb). He served both the Zengid and Ayyubid rulers of Syria and Egypt. He played a pivotal role in Saladin's conquest of Muslim Syria and later held major commands in a number of battles against the Crusader states and the forces of the Third Crusade.