Namesakes
Roman and Byzantine Emperors:
4 emperors
Emperor Romanus Lecapenus (a.k.a. Romanos) 920-944 
Emperor Romanus (a.k.a. Romanos) 959-963
Emperor Romanus Argyrus (a.k.a. Romanos) 1028-1034
Emperor Romanus Diogenes (a.k.a. Romanos) 1067-1071
Saints:
1 saint
Saint Romanus the Melodist (a.k.a. Romanos) ?-540