the Protestant Reformation and which lack apostolic succession in the sacrament of orders are not "Churches" in the proper sense. The Eastern Christian Churches that are not in communion with Rome, such as the Eastern Orthodox Church, Oriental Orthodoxy and the Assyrian Church of the East, are Churches in the proper sense and sister Churches of the Catholic particular Churches, but since communion with the Pope is one of the internal constitutive principles of a particular church, they lack something in their condition, while on the other hand the existing division means that the fullness of universality that is proper to the church governed by the successor of St Peter and the bishops in communion with him is not now realised in history. Efforts at reconciliation Anglican-Roman Catholic International Commission The Anglican-Roman Catholic International Commission (ARCIC) statement of Venice (1976) states that the ministry of the bishop of Rome among his brother bishops was "interpreted" as Christ's will for his church; its importance was compared "by analogy" to the position of Peter among the apostles. Joint worship service with the Archbishop of Canterbury At a joint service during the first official visit of the then Archbishop of Canterbury, Robert Runcie, to the Vatican, Runcie appealed to Anglicans to consider accepting papal primacy in a reunified church. At the same time, Pope John Paul II stressed that his office must be more than a figurehead. Ut unum sint John Paul II invited, in Ut Unum Sint, his 1995 encyclical on commitment to ecumenism, the "pastors and theologians" of Churches and Ecclesial Communities not in full communion with the Catholic Church to suggest how to exercise papal primacy in ways that would unite rather than divide. Joint International Commission for Theological Dialogue In October 2007, the Joint International Commission for Theological Dialogue Between the Catholic Church and the Orthodox Church, agreed that the pope has primacy among all bishops of the Church, something which has been universally acknowledged by both churches since the First Council of Constantinople in 381 (when they were still one Church) though disagreements about the extent of his authority still continue. The document "draws an analogy among the three levels of communion: local, regional, and universal, each of which appropriately has a 'first' with the role of fostering communion, in order to ground the rationale of why the universal level must also have a primacy. It articulates the