High Quality Content by WIKIPEDIA articles! Yahya Muhammad Hamidaddin (or Imam Yahya) (1869 1948) became imam of the Zaydis in 1904 and Imam of Yemen in 1918. His name in full was Amir al-Mumenin al-Mutawakkil 'Ala Allah Rab ul-Alamin Imam Yahya bin al-Mansur Bi'llah Muhammad Hamidaddin, Imam and Commander of the Faithful. Yahya Muhammad Hamidaddin was born on Friday 18 June 1869 in Sanaa into the Hamidaddin branch of the al-Qasimi dynasty. Upon the death of his father in 1904, Yahya became Imam, effectively ruler over the mountainous areas of the future North Yemen. However the Ottomans who made claim on the area didn't recognize the rule of the Imams of Yemen since their entry into Yemen.