The phrase "apostles of a united Europe" refers to individuals who actively work towards promoting unity and collaboration among different European nations. Synonyms for this term could include "champions of European integration," "advocates for a unified Europe," or "zealots for European solidarity." These individuals may be politicians, activists, or other influential figures who believe that a strong, united Europe is essential for achieving shared goals such as economic prosperity, cultural cooperation, and political stability. While the phrase "apostles of a united Europe" may suggest a certain level of devotion or religious fervor, these synonymous terms emphasize the practical and strategic importance of European unity in the modern world.