Namesakes
Marcus Flavius Valerius Constantius
(a.k.a. Constantius) (m) c. 250-306 
Roman and Byzantine Emperors 305-306
Flavius Julius Constantius
(a.k.a. Constantius) (m) 317-361
Roman and Byzantine Emperors 337-361
Flavius Constantius
(a.k.a. Constantius) (m) ?-421
Roman and Byzantine Emperors 421
Constantius of Perugia
(m) ?-170
Saints
Constantius
(m) ?-520
Saints
Constantius of Fabriano
(m) ?-1481
Saints