Answer
Yahya Khan succeeded Ayub Khan as president of Pakistan in 1969 after Ayub Khan was forced to resign due to mass protests against his government. Khan was a military officer who had served as Ayub Khan's deputy president since 1960. He was elected president by the National Assembly in March 1969 and served until 1971, when he was overthrown by a military coup led by General Zia-ul-Haq.