After much negotiation, at the request of the Persian Government, an order was issued by the Turkish Government summoning Baha'u'llah to Constantinople.. His followers.. besieged the house of their beloved leader to such an extent that the family encamped in the Garden of Najib Pasha outside the town.. while the caravan was being prepared for the long journey.. on the first of these twelve days (April 22 to May 3, 1863, nineteen years after the Bab's Declaration).. Baha'u'llah announced.. that He was the One Whose coming had been foretold.. (29:3)

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Baha'u'llah & the New Era
J. Esslemont