Ecumenical Patriarch Bartholomew I, the spiritual leader of Eastern Orthodox Christians worldwide, has thought profoundly about the role of law as it applies to the church, to civic life in Europe, to human rights, to religious freedom, and to the environment. In this book, leading scholars across the world reflect critically on the significance of his legal thought for human flourishing, for Christian social teaching, and for Christian unity. His legal thought is summed up in five key public addresses that he has delivered around the world in recent years, on: church law as an ecumenical instrument; the role of religion in a changing Europe; Orthodoxy and human rights; religion and freedom; and climate change, ecumenical imperatives. The collection presents critical reflections on the legal thought in these five important, distinct, and topical fields of human life. Its ten chapters, with two chapters devoted to each of his five addresses, are written by leading scholars across the world from different Christian traditions with expertise in the fields studied. They provide an analysis of the legal thought of the Patriarch, explain its significance legally, theologically, and politically, and propose its unifying value for the whole of global Christianity today. The book will be essential reading for academics and researchers working in the areas of law and religion, legal philosophy, comparative canon law, theology, and ecumenical studies.