Al-Mundhir had inherited the throne of Córdoba at his father's death in 886.

During the two years of his reign, al-Mundhir has continued the fight against the rebel Umar ibn Hafsun.

He dies in 888 at Bobastro, possibly murdered by his brother Abdullah ibn Muhammad al-Umawi, who succeeds him.

This is unlikely, as ibn Muhammad shows very little interest in governing, becoming a neurotic recluse who is only interested in hunting and his faith.

Once in power, however, he shows no reluctance to dispose of those he views as a threat, even if they are family.

Two of his own brothers are executed on his orders, and he commands one of his sons (al-Mutarrif) to kill his own brother.