Briefly, it seems that the much of the difference between the present Roman Catholic understanding of the role of St Peter in the Church and that of the Orthodox understanding is connected with the models of what it is that each Pope of Rome assumes on ascending the throne. Is it as bishop of the first See of the Catholic Church, or is it as an heir to the authority of St Peter? Is his status of Pope bound to his status as Bishop or to an inherited authority that is not dependant on being Bishop? Is the position dependent on the See of Rome and its location or only on a legal recognition of a candidate as being the legitimate heir of the Papacy? These are some of the questions arising from the model presented in Ullmann and that from an Orthodox perspective. I will fill this post later with more thoughts, but it is largely to allow the continuance of a discussion begun elsewhere. Please feel to drop in any comments about this particularly or in general about the place of St Peter focusing on patristic evidence and possible theological/ecclesiological models for understanding it.
Ullmann and the legal framework for Papal Succession