The role of 'High Representative for Common Foreign and Security Policy' was created by the Treaty of Amsterdam, which entered into force in 1999. A decade later, the Treaty of Lisbon expanded the role, adding significant new responsibilities. Called from that point onwards the 'High Representative of the Union for Foreign Affairs and Security Policy', the post was also extended to include the role of Vice-President of the Commission.
On the same day that the Treaty of Lisbon took effect – 1 December 2009 – the expanded position of High Representative/Vice-President was officially inaugurated and the first person to hold the position – Catherine Ashton – started her mandate.