Religion

https://en.wikipedia.org/wiki/Caliphate#Government

https://en.wikipedia.org/wiki/Hierarchy_of_the_Catholic_Church

https://en.wikipedia.org/wiki/Eastern_Orthodox_Church_organization

https://en.wikipedia.org/wiki/Ahmadiyya_Caliphate

https://en.wikipedia.org/wiki/Shiromani_Gurdwara_Parbandhak_Committee