'Servant of Bahá'. Abdu'l-Bahá became a teacher in his own right, and was called 'Master' by people who knew him.
When Bahá'u'lláh died in 1892, he chose his son Abdu'l-Bahá as his successor. There were relatives that were resentful of his inheritance and they made false accusations against him.
Abdu'l-Bahá started building works on the side of Mount Carmel on the basis of instructions from his father. He intended to build a permanent resting place for the remains of the Báb and meeting rooms for the services for Bahá'ís. The authorities listened to the jealous relatives and were led to believe that he was planning to build a fortress. As a result he was imprisoned in Akka.
He was only released during the Turkish revolution in 1908. In 1911 he made the message of the Bahá'ís available to a much wider audience by doing a tour of the western world, specifically Europe and America.
He returned to Haifa and spent his life teaching, writing and meditating daily. He died on 28 November 1921.
There are three Ages in the Baha'i Faith.
Apparently the passing of 'Abdu'l-Baha was the end of the Heroic Age, the first one of the three Ages.
The Heroic Age or the Apostolic Age had three epochs (significant periods of time).
The first epoch of nine years took place during the Badi Dispensation with the leadership of the Bab.
The second epoch of thirty-nine years was the ministry of Baha'u'llah.
The third and last epoch of the Heroic Age was the twenty-nine years of the ministry of 'Abdu'l-Baha.
When 'Abdu'l-Baha passed on, the Baha'i Faith entered the Formative Age. The first epoch of the Formative Age, during the leadership of Shoghi Effendi, the Guardian of the Faith, lasted twenty-five years.
The Baha'i Faith is now in the second of many Epochs of the Formative Age. '
Abdu'l-Baha divided the epochs into stages or plans, each having a goal for the Baha'i Faith.
The final epoch, The Golden Age, is far off in the theme of time. The Baha'i believe that in the Golden age there will be no war, where humanity can live in world peace, free of prejudice and hatred.