This book is a comprehensive examination into the shifting international thought of Alfred Zimmern, a Grecophile intellectual, one of the most prominent liberal internationalists and the world’s first professor of IR. Identifying the writings of Burke and cultural Zionism as two important ideological sources that defined his project for empire and global order, this book argues that Zimmern can best be understood as an apostle of Commonwealth. It shows that while his proposals changed from cosmopolitan democracy to Euro-Atlanticism and to world federal government, they were constantly shaped by the organizing principles of a professedly universal British Commonwealth. It was the empire transhistorically chained to classical Athens.