What is "nabil-i-a`zam"

Mullá Muḥammad-i-Zarandí (29 July 1831 – 1892), more commonly known as Nabíl-i-A’ẓam ( "the Great Nabíl") or Nabíl-i-Zarandí ( "Nabíl of Zarand"), was an eminent Bahá'í historian during the time of Bahá'u'lláh, and one of the nineteen Apostles of Bahá'u'lláh. He is most famous for authoring The Dawn-breakers, which stands out as one of the most important and extensive accounts of the ministry of the Báb.

He learned about the Bábí Faith at the age of 16 and met Bahá'u'lláh in 1851. He made several journeys on behalf of Bahá'u'lláh, was imprisoned in Egypt and is the only person known to have made the two pilgrimages to the House of the Báb in Shíráz and the House of Bahá'u'lláh in Baghdád in accordance with the rites set out by Bahá'u'lláh. After the passing of Bahá'u'lláh, and at the request of `Abdu'l-Bahá, he arranged a Tablet of Visitation from Bahá'u'lláh's writings which is now used in the Holy Shrines. Shortly afterwards, overcome with grief, he walked into the sea and drowned.