Constantinople was the capital of the Ottoman Empire from
1453 until 1922. During Bahá’u’lláh’s sojourn in this city, the tyrannical
Sultan ‘Abdu’l-‘Azíz occupied the throne. The Ottoman Sultans were also the
Caliphs, the leaders of Sunní Islám. Bahá’u’lláh anticipated the fall of the
Caliphate, which was abolished in 1924. - The Universal House of Justice (The
‘Notes’ section of the Kitab-i-Aqdas)
