The President of Pakistan is Pakistan's Head of State. At various times in history, changes in the Constitution of Pakistan have altered the powers and privileges associated with the office of the President. At present, Pakistan has a Semi-presidential system of government.
According to the Constitution, the President is chosen by an electoral college consisting of the Senate, National Assembly, and the provincial assemblies.
The Constitution gives the President the reserve powers to dissolve the National Assembly of Pakistan (thereby triggering new elections) and to dismiss the Prime Minister. The President also chairs the National Security Council and appoints the heads of the Army, Navy and Air Force.
Originally, Pakistan was a dominion within the British Commonwealth with the British Monarch as head of state. The monarch was represented in Pakistan by the Governor General. In 1956, dominionship was ended when Pakistan established it's first constitution, and the position of Governor General was replaced by President.
Pakistan's first president was Iskander Mirza, who was also the last Governor General. In 1958, he abrogated the constitution and declared martial law. A few weeks later, he was overthrown in a bloodless Coup d'état by General Ayub Khan who had himself declared President. The constitution was revised, and the President became the ruler of Pakistan. The constitution also stipulated that the President be elected by the people. Elections were held in 1963, and Khan defeated the sister of Muhammad Ali Jinnah, Fatima.
Ayub Khan continued as pesident until March 25, 1969, and he passed the Presidency onto Yahya Khan. Yahya Khan stepped down after the Indo-Pakistani War of 1971, and Zulfiqar Ali Bhutto became the new president and presided over the formation of a new Constitution. This constitution was completed in 1973, and reduced the presidency to a figurehead position, giving power to the Prime Minister. Bhutto stepped down as President and became Prime Minister, symbolizing the transition. The President was henceforth elected by legislative assembly members, not by popular vote. Popular vote would be used to directly elect the members of the National Assembly, including the Prime Minister.
In 1978, Prime Minister Bhutto was toppled by General Muhammad Zia ul-Haq who declared himself President. The presidency again became the premier position in the Pakistani government. Zia introduced the Eighth Amendment which gave reserve powers to the President's office. Zia died in 1988, and the Prime Minister's office regained leadership of the country. The Presidency retained its reserve powers until 1997, when the Thirteenth Amendment was passed.
However, the 1999 coup of General Pervez Musharraf brought executive powers back to the President's office. National and provincial elections were held in 2002. In December 2003, the Seventeenth Amendment partially restored the President's reserve powers. In January 2004, the Electoral College gave Musharraf a vote of confidence, as result of which he was (according to the Constitution) "deemed to be elected." Musharraf's term of office as president ends in 2007.
For the heads of state from 1947 to 1956, see Governor General of Pakistan
note - * denotes military leaders