Final answer:
The governor in question is The third caliph's foster brother Abdullah who oppressed and excessively taxed Egyptians, leading to riots calling for his dismissal.
Step-by-step explanation:
The governor in question is The third caliph's foster brother Abdullah.
During this time, there was oppression and excessive taxation of Egyptians by the governor. As a result, riots calling for his dismissal broke out.
It is important to note that the governor being referred to is not Muawiya, but Abdullah, who was the foster brother of the third caliph.
Learn more about The identity and actions of the governor