The post-Lisbon high representatives: an introduction

The Lisbon Treaty recently celebrated its 10th anniversary. The 2009 legal text was an attempt to enhance the unity, consistency and effectiveness of the EU’s action in an increasingly volatile world. And yet, the post-Lisbon time period has been characterised by multiple crises coming from the West, the East, the South, and even from within the EU. Against this backdrop, our Special Issue makes a systematic assessment of the EU's foreign policy post-Lisbon and of its evolution by focusing on the role of the High Representative of the Union for Foreign Affairs and Security Policy (HR/VP). Assessing the post-Lisbon HR/VPs provides important insights on EU foreign policy processes over the past decade. In this introduction, we discuss the three research questions that guide our collection of articles, as well as our theoretical and empirical contribution to existing scholarly literature.