Bahá'u'lláh stated that the tyranny of Sultán `Abdu'l-`Azíz exceeded that of Násiri'd-Dín Sháh because the Sultán exiled Bahá'u'lláh to the Most Great Prison without any reason whereas the Sháh had reason to be fearful of the Bahá'ís because of the attempt on his life. [BKG412]
Bahá'u'lláh had addressed two Tablets to the Sultán including the Súriy-i-Mulúk (Tablet to the Kings) but he did not respond. [BBD2]
See The Summons of the Lord of Hosts p177-181 for the Lawh-i-Fu'ád and p185-235 for the Súriy-i-Mulúk.
1876-08-31 — Deposition of Murád V followed by the accession of `Abdu'l-Hamíd II to the Sultanate of the Ottoman Empire, upon which the banishment decree of Sultan 'Abdu'l-Aziz for Bahá'u'lláh was relaxed.
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