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Anthony Charles Lynton "Tony" Blair (born 6 May 1953) is a British Labour politician who served as the Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007. He was the Member of Parliament for Sedgefield from 1983 to 2007 and Leader of the Labour Party from 1994 to 2007; he resigned from all these positions in June 2007.

Tony Blair was elected Leader of the Labour Party in the leadership election of July 1994, following the sudden death of his predecessor, John Smith.

Under his leadership, the party adopted the term "New Labour" and moved away from its traditional left wing position towards the centre ground. Blair subsequently led Labour to a landslide victory in the 1997 general election.

At 43 years old, he became the youngest Prime Minister since 1812. In the first years of the New Labour government, Blair's government implemented a number of 1997 manifesto pledges, introducing the minimum wage, Human Rights Act and Freedom of Information Act; and carrying out regional devolution, establishing the Scottish Parliament, the National Assembly for Wales, and the Northern Ireland Assembly.

Blair's role as Prime Minister was particularly visible in foreign and security policy, including in Northern Ireland, where he was involved in the 1998 Good Friday Agreement.

From the start of the War on Terror in 2001, Blair strongly supported United States foreign policy, notably by participating in the 2001 invasion of Afghanistan and 2003 invasion of Iraq. In his first six years, Blair had British troops ordered into battle five times — more than any other prime minister in British history.

Blair is the Labour Party's longest-serving Prime Minister; the only person to have led the Labour Party to three consecutive general election victories; and the only Labour Prime Minister to serve consecutive terms, more than one of which was at least four years long. He was succeeded as Leader of the Labour Party on 24 June 2007 and as Prime Minister on 27 June 2007 by Gordon Brown, who was Chancellor of the Exchequer.

On the day he resigned as Prime Minister, he was appointed the official Envoy of the Quartet on the Middle East on behalf of the United Nations, the European Union, the United States, and Russia.

In May 2008, Blair launched his Tony Blair Faith Foundation. This was followed in July 2009 by the launching of the Faith and Globalisation Initiative with Yale University in the USA, Durham University in the UK and National University of Singapore in Asia to deliver a postgraduate programme in partnership with the Foundation.