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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Main sources for early Venice
A summary of the main primary sources for the early history of Venice, and where to find them.