Reference: Deliyannis (2004) The Book of Pontiffs of the Church of Ravenna
Agnellus : Ravennatis. , and Deliyannis, Deborah Mauskopf. _The Book of Pontiffs of the Church of Ravenna_. Washington Catholic University of America Press, 2004.
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Episode 28 — The early sources
The principal primary sources for the earliest period of Venice are not many, but their history is rather messy.