How have religious leaders such as popes or caliphs influenced the selection of monarchs?

Religious leaders and institutions have historically influenced the selection and legitimation of monarchs through symbolic acts, religious doctrine, and the assertion of divine authority.

• Coronation and Anointment: In many traditions, religious leaders performed rituals such as anointment and coronation to signify that a ruler’s power was sanctioned by the divine. For example, the papacy played a pivotal role in the Holy Roman Empire; notably, Pope Leo III crowned Charlemagne as emperor in 800 CE, an act that established a precedent for papal involvement in imperial succession.12
• Divine Right Doctrine: The divine right of kings asserted that monarchs derived their authority directly from God. This doctrine, supported by religious theorists, suggested that because kings were God’s representatives, they were not accountable to earthly institutions like parliaments.34
• Theocratic Leadership: Some leaders, such as the caliphs in the Islamic state, functioned as both religious and political heads. While early caliphs were chosen through shura (consultation) and bay'ah (allegiance), the office itself was inherently tied to the leadership of the Muslim community, with religious qualifications—such as lineage—often debated by scholars to determine legitimacy.56

These interactions often created a complex power dynamic where religious leaders could claim the authority to transfer or validate imperial power, while monarchs sought to use religious prestige to solidify their own rule.23