Prove that the union of the king and the Christian church was mutually beneficial.

Benefits from the union for the king:

1. The Church recognized him as the vicar of God on Earth;

2. The Church carried out “educational work” with the common people, urging the people not to murmur against the king, but to be faithful to him;

3. In the event of a power crisis or lack of money, the church could provide assistance to the monarch.

Benefits of the union for the church:

1. The king endowed the monasteries with land, peasants and money;

2. The king could involve the highest church dignitaries in the discussion of state affairs, entrusting them not only spiritual, but also secular authority.