Insignia
A chief symbol of the Ottoman Caliphate was the "Great Banner of the Caliphs," a large green banner embroidered with texts from the Qur'an and with the name of Allah emblazoned on it 28,000 times in golden letters. It was passed down in the Ottoman dynasty from father to son and only carried into battle if the Sultan himself or his specifically designated representative was there in person.
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Flag of the Caliphate (1517–1844)
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Flag of the Caliphate (1844–1923)
Read more about this topic: Ottoman Caliphate