Ecclesiarch

The Ecclesiarch is the nominal leader of the Ecclesiarchy. Elected for life by the Holy Synod, a gathering of the most proeminent Cardinals, the Ecclesiarch's main concerns are representing the Ecclesiarchy in the Senatorum Imperialis, the ordering of crusades of Faith, and the monitoring of the devotion of the Imperial citizenry. Since M32, The Ecclesiarch always holds a position as one of the High Lords of Terra, the ruling council of the Imperium. He rules the Ecclesiarchy from the Ecclesiarchal Palace on Terra, which is one of the most popular sites of Piligrimage in the whole Imperium.

List of Best Known Ecclesiarchs
There have been close to 600 human beings who ever bore the title of Ecclesiarch during the 10 millenia of existence of the Imperium, the following short list contains the most (in)famous amongst those to ever occupy the lofty position: