Pope Leo finds that the collapse of the Western Roman Empire makes it more difficult for him to assert his authority in Gaul, Hispaniae and Northern Africa. Yet, the support of Emperor Valentinian III provides a strong boost to Leo in those lands still under imperial control.

Links:
Icon of Leo the Great. Photo by Wlbw68

Letter of Pope Leo on the conflict with Hilary of Arles

Letter of Pope Leo to Bishop Turibus on the Priscillians

Valentinian III’s decree endorsing papal authority

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#449 – A History of the Catholic Church – The Challenge of the Papacy