Final answer:
The Pope's authority had a significant impact on the English Medieval civil strife due to his religious and political power as the head of the Catholic Church.
Step-by-step explanation:
The Pope's authority over the English Medieval civil strife was highly influential. As the head of the Catholic Church, the Pope held great religious and political power during this period. The Pope could excommunicate or even depose monarchs, and his endorsement or condemnation influenced the legitimacy and stability of rulers. Additionally, Rome's status as an important center of the faith meant that the Pope's decisions and decrees carried considerable weight in the religious and political affairs of England.
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