It is known as regalism to the royalty system or scheme. A regalista, meanwhile, is someone who defends the royalties of the monarchy in the link between the State and church.
Before moving forward with the concept, it is important to be clear about what the royalties. This is the name of a prerogative exercised by a sovereign from his supreme power. A royalty is also called a particular privilege: formerly, the idea specifically alluded to the privilege that the Vatican awarded to monarchs in some matter associated with the discipline of church.
Returning to the concept of regalism, it is usually used with respect to theories that provide sustenance to Monarchs’ exclusive right to certain royalties, especially those that came into conflict with the rights of the leader of the Catholic Church (the dad).
In the Middle Ages, regalism supposed the defense of the civil power in front of the ecclesiastical power. It was a doctrine put into practice by Catholic monarchies when interacting with the Church.
Regalism, in short, consolidated Rights of the king versus jurisdictions of the pope or even of nobles. Minting coins and administering justice, in this framework, could be considered primitive royalties.
With regard specifically to the interaction with the church, the Spanish regalism promoted, for example, the right of presentation. This resource allowed the king to propose candidates for the pope to appoint a bishop. Some rulers even achieved the Royal Board, which granted them the right to appoint the bishops of a territory directly.