Obeiditi, v. Fatimiti, II, 132.
Oca Filadelfo, II, 291.
Occidente (impero di), III, 5, 26, 40, 144.
Occimiano (marchesi di), III, 199.
Oddone, lombardo, III, 224, v. Odone e Otone.
Odenato, 31.
Odilone, abate di Cluny, III, 13.
Odin, II, 512; III, 15, 16, 18.
Odoacre, 11, 12; II, 90.
Odone, duca, II, 325.