Yahya Muhammad Hamid ed-Din (or Imam Yahya) (18 June 1869 — 17 February 1948) became Imam of the Zaydis in 1904 after the death of his father, Muhammad Al-Mansur, and Imam of Yemen in 1918. His name and title in full was His majesty 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 (the prince of the believers, he who relies on God, the Lord of the Universe).