Mullá Husayn (1813 – 2 February 1849) (Persian: ملا حسين بشروئي Mulláh Hossein Boshru'i), also known by the honorific Jináb-i Bábu'l-Báb ("Gate of the Gate"), was a Persian religious figure in 19th century Persia and the first Letter of the Living of the Bábí religion. He was the first person to profess belief in the Báb as the promised Mahdi of Islam and a Manifestation of God, founding a new independent religion. The title of Bábu'l-Báb was bestowed upon him by the Báb in recognition of his status as the first Bábí.