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Caliphate - Wikipedia
Caliphate | History, Empire, Meaning, & Definition | Britannica
Islamic Caliphates - World History Encyclopedia
Islamic Caliphates Timeline - World History Encyclopedia
What a caliphate really is—and how the Islamic State is not one
Causes and consequences of the Caliphate | Britannica
Caliphate Definition & Meaning - Merriam-Webster
Rashidun Caliphate - World History Encyclopedia
Caliph | Definition & History | Britannica
Caliphate | Oxford Research Encyclopedia of Religion