Answer: The Catholic Church
Explanation: After the fall of the Roman Empire, which means the Western Roman Empire, the main political power, which was the main religious power, became the Catholic Church, i.e. at the time of the fall of the Western Roman Empire, Western Church. The church began to unite Europe by taking over governance and managing civic duties. It means that the church, in addition to the spiritual, practically had secular authority, and was in close contact with local kings and lords.