Cette thèse analyse le développement de l’identité institutionnelle de la papauté pendant l’époque byzantine, c’est-à-dire la représentation de l’Église romaine dans certaines sources officielles entre l’âge de l’empereur Justinien et la première moitié du huitième siècle. Le dossier des sources se concentre sur les actes des conciles œcuméniques et la production officielle du pouvoir impérial et de la papauté. Le propos est de montrer que loin d’être monolithique, l’identité institutionnelle de la papauté était changeante et fluide, et que les éléments qui la composaient se trouvaient modifiés selon le contexte, les nécessités et les enjeux du pouvoir. L’étude se focalise en particulier sur les disputes ecclésiologiques et les conciles destinés à les résoudre : la controverse des Trois Chapitres et le deuxième concile de Constantinople de l’année 553, la dispute monoénergiste et monothélite qui donne lieu au concile du Latran de l’année 649 et au troisième concile de Constantinople des années 680-681, et le concile quinisexte des années 691-692. Elle incorpore aussi d’autres développements liés à la représentation de la place de l’Église romaine, le rôle des papes, et la réception des conciles œcuméniques. / This dissertation analyses the development of the institutional identity of the Papacy during the Byzantine period, that is, the representation of the Roman Church in some official sources between the age of Emperor Justinian and the first half of the eighth century. The main sources are the acts of the ecumenical councils, as well as the official production of the imperial power and the papacy. The purpose is to show that, far from being monolithic, the institutional identity of the papacy was changing, dynamic and fluid, and the elements that composed it were modified according to the context, the necessities and the relations of power. The study focuses in particular on ecclesiological disputes and the councils aimed at resolving them : the Three Chapters controversy and the Second Council of Constantinople of 553, the monothelite dispute, including the Lateran Council of 649 and the Third Council of Constantinople of 680-681, and the Quinisext Council of 691-692. It also incorporates other developments related to the representation of the place of the Roman Church, the role of Popes, and the reception of ecumenical councils.

This study is concerned with the style of leadership needed to enable the church to fully express itself in mission. The renewed ecclesiology of the Second Vatican council, in which the church is said to be missionary by nature, is reviewed. The fundamental structure of the church is described theologically under the themes of the people of God, creation of the Holy Spirit and the body of Christ. A study of the Council's teaching on a pyramidal style ofleadership leads to the conclusion that it is inadequate for implementing the teaching on the missionary nature of the church. A review of post-Vatican II ecclesial movements worldwide points to a strong desire among many for a church of greater participation with a more personal leadership style. A study of leadership in the corporate world shows how a servant-style is replacing the traditional pyramidal structure. It is shown how this servant-leadership style could also be used in the church. The results of a qualitative research study of St. Joseph's Parish in Metro Manila, Philippines, are presented. This shows how the pastor gathered around him a group of lay leaders who share and express his style of servant-leadership. This part of the study begins by setting the historical context within which this parish exists by giving an overview of the history of the church in the Philippines and then shows how the leaders of St. Joseph's Parish motivated a passive congregation to become a church-in-mission. This occurred over a number of years through the parishioners being invited to full participation in parish life and becoming involved in service of those in need. An intense formation programme by parish leaders, who used a servant-leadership style, helped lead this parish from its former passivity to a manifestation of the missionary nature of the church. The study concludes by identifying some themes for further research. / Christian Spirituality, Church History and Missiology / D.Th.(Missiology)

This study is concerned with the style of leadership needed to enable the church to fully express itself in mission. The renewed ecclesiology of the Second Vatican council, in which the church is said to be missionary by nature, is reviewed. The fundamental structure of the church is described theologically under the themes of the people of God, creation of the Holy Spirit and the body of Christ. A study of the Council's teaching on a pyramidal style ofleadership leads to the conclusion that it is inadequate for implementing the teaching on the missionary nature of the church. A review of post-Vatican II ecclesial movements worldwide points to a strong desire among many for a church of greater participation with a more personal leadership style. A study of leadership in the corporate world shows how a servant-style is replacing the traditional pyramidal structure. It is shown how this servant-leadership style could also be used in the church. The results of a qualitative research study of St. Joseph's Parish in Metro Manila, Philippines, are presented. This shows how the pastor gathered around him a group of lay leaders who share and express his style of servant-leadership. This part of the study begins by setting the historical context within which this parish exists by giving an overview of the history of the church in the Philippines and then shows how the leaders of St. Joseph's Parish motivated a passive congregation to become a church-in-mission. This occurred over a number of years through the parishioners being invited to full participation in parish life and becoming involved in service of those in need. An intense formation programme by parish leaders, who used a servant-leadership style, helped lead this parish from its former passivity to a manifestation of the missionary nature of the church. The study concludes by identifying some themes for further research. / Christian Spirituality, Church History and Missiology / D.Th.(Missiology)