This privileged position did not long survive Bahá'u'lláh's announcement of support for the message of the Báb. Engulfed in the waves of violence unleashed upon the Bábís after the Báb's execution Bahá'u'lláh suffered not only the loss of all His worldly endowments but was subjected to imprisonment, torture, and a series of banishment. The first was to Baghdad where, in 1863, He announced Himself as the One promised by the Báb. From Baghdad, Bahá'u'lláh was sent to Constantinople, to Adrianople, and finally to Acre, in the Holy Land, where He arrived as a prisoner in 1868.

From Adrianople and later from Acre, Bahá'u'lláh addressed a series of letters to the rulers of His day that are among the most remarkable documents in religious history. They proclaimed the coming unification of humanity and the emergence of a world civilisation.

The kings, emperors, and presidents of the nineteenth century were called upon to reconcile their differences, curtail their armaments, and devote their energies to the establishment of universal peace.

Bahá'u'lláh passed away at Bahjí, just north of Acre, and is buried there. His teachings had already begun to spread beyond the confines of the Middle East, and His Shrine is today the focal point of the world community that these teachings have brought into being.

While `Abdu'l-Bahá was still a prisoner of the Ottomans the first Bahá'í pilgrims from the western world arrived in Acre in 1898. After His release in 1908, `Abdu'l-Bahá set out on a series of journeys that, in 1911-1913, took Him to Europe and America. There He proclaimed Bahá'u'lláh's message of unity and social justice to church congregations, peace societies, the members of trade unions, university faculties, journalists, government officials, and many public audiences.