People: Heads of State
Gordon Brown replaced Tony Blair as the prime minister of Britain in June of 2007. Brown was finance minister, also known as the chancellor of the exchequer, during the entirety of Tony Blair's 10 years in office.
The two men were decisive in changing the constitution of Britain's Labour Party, which prior to Blair's election victory in 1997 had been out of power for almost two decades.
Political legend has it that before becoming prime minister, Blair promised Brown he would step aside after only one term as premier to let his long-time political partner lead the country.
In the end, Tony Blair resigned midway in his third term. Before Blair's ascendancy to power, no British Labour prime minister had won even two elections in a row.