Treaty of Lisbon

December 13, 2007 · Jerónimos Monastery, Lisbon

Treaty that reformed the European Union after the failed constitution. In force from 2009, it created a permanent President of the European Council and the Article 50 procedure for leaving the Union.

Key people

Participants

Before and after

Followed from
Treaty establishing a Constitution for Europe October 29, 2004

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Treaty of Lisbon