ʻAbdu'l-Bahá, born ʻAbbás, was the eldest son of Baháʼu'lláh and served as head of the Baháʼí Faith from 1892 until 1921. ʻAbdu'l-Bahá was later canonized as the last of three "central figures" of the religion, along with Baháʼu'lláh and the Báb, and his writings and authenticated talks are regarded as sources of Baháʼí sacred literature.
ʻAbdu'l-Bahá (right) with his brother Mírzá Mihdí
Prison in ʻAkká where Baháʼu'lláh and his family were housed
Early Western Baháʼí pilgrims. Standing left to right: Charles Mason Remey, Sigurd Russell, Edward Getsinger and Laura Clifford Barney; Seated left to right: Ethel Jenner Rosenberg, Madam Jackson, Shoghi Effendi, Helen Ellis Cole, Lua Getsinger, Emogene Hoagg
Effendi or effendy is a title of nobility meaning sir, lord or master, especially in the Ottoman Empire and the Caucasus. The title itself and its other forms are originally derived from Medieval Greek aphentēs which is derived from Ancient Greek authentēs meaning lord.
Figurine of an effendi, circa 1770, hard-paste porcelain, height: 10.8 cm, Metropolitan Museum of Art (New York City)