أحمد بن يحيى
Al-Badr was born in 1926 as oldest son of Ahmad bin Yahya, later imam of the Zaydis and king of North Yemen. In 1944 he moved to Taizz in the south of the country, where his father had already been the Imam's deputy for several years, to continue his education. Soon after the assassination of Imam Yahya in February 1948 plotted by Sayyid Abdullah al-Wazir, al-Badr arrived in Sana'a, the capital, but apparently only gave tacit support to the new regime. Meanwhile, Sayf al-Islam Ahmad had managed to get away from Taizz and made for Hajjah, where he gathered the tribes around him, proclaimed himself Imam with the title of al-Nasir and within a month of the assassination had easily regained control of Sana'a and executed the principal perpetrators of the rebellion.