Abdu'l-Baha
Biography:
Abdu'l-Baha: (1844–1921) Son of Baha'u'llah, designated His successor and authorized interpreter of His writings. Named Abbas after His grandfather, Abdu'l-Baha was known to the general public as Abbas Effendi. Baha'u'llah gave Him such titles as "the Most Great Branch," "the Mystery of God," and "the Master." After Baha'u'llah's passing, He chose the name Abdu'l-Baha, meaning "Servant of Baha'u'llah."