Namesakes
Flavius Valentinianus
(a.k.a. Valentinianus) (m) 321-375 
Roman and Byzantine Emperors 364-375
Flavius Valentinianus
(a.k.a. Valentinianus) (m) 371-392
Roman and Byzantine Emperors 375-392
Flavius Placidius Valentinianus
(a.k.a. Valentinianus) (m) 419-455
Roman and Byzantine Emperors 425-455