Namesakes

Roman and Byzantine Emperors: 3 emperors
Emperor Flavius Valentinianus (a.k.a. Valentinian)   364-375  
Emperor Flavius Valentinianus (a.k.a. Valentinian)   375-392  
Emperor Flavius Placidius Valentinianus (a.k.a. Valentinian)   425-455  
Saints: 1 saint
Saint Valentinian   ?-500