1956: Pakistan is proclaimed an Islamic republic, Iskander Mirza becomes first president

1958: Martial law is declared, Mirza is sent into exile and Field Marshal Ayub Khan declares himself president.

1962: Martial law suspended.

1965: Ayub Khan wins presidential election.

1969: General Yahya Khan takes over following Ayub Khan's resignation, martial law declared.

1971: President Yahya cedes power to Zulfiqar Ali Bhutto who becomes president.

1973: Martial law suspended as Bhutto becomes prime minister and Fazal Ilahi Chaudhry becomes president under new constitution.

Zia died in a mysterious plane crash [AP]

1978: Zia becomes Pakistan's sixth president.

1979: Political parties banned, Bhutto is hanged.

1985: Martial law and ban on political parties lifted.

1986: Bhutto's daughter, Benazir, returns from exile.

1988: Zia dies in mysterious plane crash. Ghulam Ishaq Khan becomes president, Benazir Bhutto becomes first female prime minister of a Muslim country.

1990: Bhutto dismissed on charges of corruption. Nawaz Sharif elected prime minister.

1993: Khan and Sharif resign under pressure from the army. Election returns Bhutto as prime minister. Wasim Sajjad becomes interim president. Sardar Farooq Leghari replaces Sajjad as president.

1996: Leghari dismisses Bhutto amid allegations of corruption.

1997: Nawaz Sharif wins election to return as prime minister. Wasim Sajjad becomes interim president.

1998: Muhammad Rafiq Tarar becomes 11th president of Pakistan.

Musharraf took power in a military coup [AFP]

2000: Sharif convicted of hijacking and terrorism and sentenced to life imprisonment. He is pardoned by military authorities and goes into exile in Saudi Arabia.

2001: Musharraf declares himself president while still head of the army.

2002: Musharraf elected as president in referendum criticised as unconstitutional. First general election since start of military rule. Mir Zafarullah Jamali elected prime minister.

2004: Musharraf announces he will continue as head of the army despite having previously said he would give up the role.

April 2007: In April Musharraf suspends Iftikhar Mohammed Chaudhry, the chief justice, following demonstrations. Chaudhry is reinstated in July.

August 2007: Pakistan's supreme court rules Sharif can return from exile, but he is sent to Saudi Arabia within hours of his return in September.

The same month Musharraf agrees to step down as head of the army after presidential elections in October.

October 2007: Musharraf wins presidential elections in Pakistan, but must await decision from the supreme court as to whether he was eligible to be a candidate.

Also in October, Benazir Bhutto, former Pakistani prime minister, returns from exile to Pakistan. During a parade in the city of Karachi attended by thousands of her supporters, a suicide bomb attack kills more than 130 of her supporters.

November 4, 2007: Musharraf declares a state of emergency in Pakistan. Troops surround Islamabad's state-run television and radio stations and police surround the supreme court.

November 28, 2007: Musharraf steps down as army chief, meeting a key demand of the international community, and ending eight years of divisive military rule. Control of the army and its nuclear arsenal are handed to General Ashfaq Kiyani, a former intelligence chief. Musharraf is sworn in as a civilian president the next day.

December 21, 2007: At least 50 people are killed in a suicide bombing at a mosque in northwest Pakistan, apparently targeting Aftab Khan Sherpao, the country's former interior minister.

December 27, 2007: Benazir Bhutto, former Pakistani prime minister, is killed by a suicide bomber who first fired shots at her before blowing himself up during an election rally in Rawalpindi, 14km south of Islamabad.

Under the terms of the deal, South Korea agreed to end missionary activities by Christian groups in Afghanistan.

Fisher said: "We have been told by the Taliban that a further group of five - four women and one man - will be released by the Taliban within the hour."

"It is like a dead child is coming back to life," Lee Hyoen-Ja, a relative of one of the kidnapped Christian aid workers, told JoongAng Daily on Wedneday.

Seo Jeung-Bae, whose son and daughter were among the hostages, said: "I want to see them and hug them hard now.

"I had not doubted for one moment that the Taliban would return my children some day, as the Taliban are also human beings and have their own families."

At Seoul's Saemmul Church, which sent the volunteers to Afghanistan, officials said the focus now would be on looking after the released hostages and their families.

"Our work for now will be to make sure the freed hostages return safely and have the time to recover, and to make sure the family members of the two who were sacrificed are comforted," Bang Yong-kyun, pastor, said.

The group of 23 volunteers from the church were seized on July 19 from a bus as they travelled through Ghazni province.

Rethink

The Taliban killed two male hostages early on in the crisis, but released two women as a gesture of goodwill during a first round of negotiations.

As news of the release spread, other South Korean churches said the kidnapping crisis had led them to rethink their evangelical activities.

Relatives reacted with joy after getting news that an agreement had been reached [AFP]

The National Council of Churches in Korea, one of the largest groups representing the country's Protestants, said in a statement it would abide by the government's pledge to end missionary work in Afghanistan.

"Through this incident, we will look back on the Korean churches' overseas volunteer and missionary work, and make this an opportunity to bring about more effective and safer volunteer and missionary work," it said.

Another Seoul-based Christian aid group, The Frontiers, said all its short-term volunteers in Afghanistan had pulled out of the country and two long-term volunteers are about to return.

Following Tuesday's talks with South Korean officials, the Taliban said they would release the 19 hostages provided Seoul pulls out its troops and stops Korean missionary work in Afghanistan by the end of this year.