Namesakes
Johannes Ducas Vatatzes
(m) 1192-1254 
Roman and Byzantine Emperors 1221-1254
Saints (John Ducas Vatatzes)
Alexius Ducas Murtzuphius
(a.k.a. Ducas) (m) ?-1205
Roman and Byzantine Emperors 1204
Constantinus Ducas
(a.k.a. Ducas) (m) 1006-1067
Roman and Byzantine Emperors 1059-1067
Michael Ducas
(a.k.a. Ducas) (m) c. 1050-1090
Roman and Byzantine Emperors 1071-1078