The two then went to Merv, where the Samanid ruler Nuh I was preparing a counter-attack against Abu 'Ali Chaghani, who had taken control over the Samanid capital of Bukhara and put Ibrahim ibn Ahmad on the throne.
Nuh eventually managed to quell the rebellion and in 948 appointed Mansur as the governor of Khorasan.
In 949, Mansur wrested Ray from the Buyid ruler Rukn al-Dawla, who was at that time in Shiraz and was ensuring his son's succession.
[2] According to Ibn Miskawayh, "he had been drinking incessantly for some days and nights, and one morning was found dead.
"[2] Mansur was then succeeded by the pardoned Abu 'Ali Chaghani as the governor of Khorasan.