Papal Decree on Ecclesiastical Power

The Tome of Leo was issued as a formal declaration by Pope Leo I articulating the doctrinal position of the Church concerning the divine and human natures of Christ. This document was instrumental in establishing the primacy of the Roman See and clarifying Christological doctrine.

It played a significant role during the Council of Chalcedon by affirming the two natures of Christ in one person, shaping orthodox Christian theology and influencing ecclesiastical politics. The Tome underscored the authority of the papacy in doctrinal matters throughout Christendom.