Файл:Mirzamehdi.jpg

Mírzá Mihdí was the youngest of three surviving children of Bahá’u’lláh and His wife Ásíyih Khánum, who is generally known by the title Navváb (Highness). Mírzá Mihdí was born in 1848 in the family’s rented house near the Shemiran Gate (Darvázih Shimrán) in northern Tehran. He was named after Mihdí, Bahá’u’lláh’s elder full brother, who was dear to Him and who had recently died. In later years Bahá’u’lláh gave Mírzá Mihdí the title "the Purest Branch."