Theocracy
Government by religious leadership or priesthood. A common phenomenon among medieval/iron age states, less common in the industrial age, almost non-existent in the Information Age (the internet savvy Islamic cultures on mid/late 21st century Earth being a rare exception), Theocracy began to flourish again among the mushrooming of utopian and eccentric factions in the Interplanetary Age. The Interstellar era saw some local theocratic biosphere-states. The Stella Umma is the only Theocratic Empire to really make it big during post-Federation time.
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