The oldest University in the world as officially listed by eastern and western historians is an Arab Islamic University (University of Al-Karaouine جامعة القرويين) located in Fas Morocco. Al-Karaouine was founded in Founded in 859 . The university was build by an Arab Muslim woman called (Fatima bent Mohammad Al-Fehri).
The second oldest University was also Arab Islamic which is Al-Azhar University.
For more information please see the below articles on Wikipedia in Arabic and English:
University of Al-Karaouine