Vatican II revolved around the word communion; yet, few works have been devoted to a revival of the entire vision of the Church around communion. Therefore the author has undertaken that task in this study, which focuses on the ecumenical ramifications of an ecclesiology of communion. This work razes the walls of misunderstanding, suspicions and claims behind which the various ecclesial traditions, Roman Catholic included, have been barricaded and from behind which they have only recently considered venturing.