Leo
Martyrological notice
The historical Roman Martyrology commemorates Leo on 11 April. The Latin notice identifies the record as confessor and pope.
Historical martyrology witness · Martyrologium Romanum (Latin historical edition)
Sancti Leonis Papae Primi, cognomento Magni, Confessoris et Ecclesiae Doctoris, cujus dies natalis recolitur quarto Idus Novembris.