April 21 or 22 (sources differ). On this date in 1863, his last day in Baghdad prior to his exile to Istanbul, Bahá'u'lláh declared to his close companions that he was "He whom God shall make manifest."

April 21 or 22 (sources differ). On this date in 1863, his last day in Baghdad prior to his exile to Istanbul, Bahá'u'lláh declared to his close companions that he was "He whom God shall make manifest," eventually becoming the most accepted of such claimants of whom there had been several since the Báb's execution in 1850. Bahá'u'lláh had lived in Baghdad for ten years, since 1853, except for his two year hiatus as Darvish Muhammad-i-Irani from 1854 to 1856 when he studied with Sufi sheikhs in the Kurdish mountains.