In 1999, the European People's Party (EPP) emerged as the largest political group in the European Parliament, maintaining its dominance for more than 25 years and influencing the direction of the EU through five consecutive Presidencies of the European Commission. In this Open Access book, the EPP's official think-tank, the Wilfried Martens Centre for European Studies, presents memories from Prime Ministers, Presidents of EU institutions, Party Presidents and EPP officials. The book traces the pivotal moments in EU politics, from the EPP's expansion to include conservative, liberal, and like-minded parties, particularly in Central and Eastern Europe, to the actual management of the new enlarged party. This book sheds light on the EPP's evolution, successes, and controversies through firsthand accounts, offering a comprehensive view of its impact on the European Union over the past quarter-century.