Muhammad al-Badr was the last king and Zaydi Imam of the Mutawakkilite Kingdom of Yemen and leader of the monarchist regions during the North Yemen Civil War.

The 1955 Yemeni coup attempt was a failed coup d'etat in which soldiers led by Colonel Ahmad Yahya al-Thulaya attempted to overthrow Imam Ahmad bin Yahya, who had ruled the Mutawakkilite Kingdom of Ye