Василий Великий
Ronald Hathaway provides a table listing most of the major identifications of Dionysius: e.g., Ammonius Saccas, Pope Dionysius of Alexandria, Peter the Fuller, Dionysius the Scholastic, Severus of Antioch, Sergius of Reshaina, unnamed Christian followers of everyone from Origen to Basil of Caesarea, Eutyches to Proclus.