Othman-ibn-abi-Obeida, 172.
Othman, pellegrino, III, 236.
Otone o Oddone, capitano del conte Ruggiero, III, 156, 225.
Otone I, imperatore, II, 262, 263, 278, 311, 312, 321, 409; III, 199.
Otone II, imperatore, II, 308, 321, 322, 323, 324, 325, 326, 327, 328, 329, 344; III, 62.
Otone III, imperatore, II, 318, 338, 339; III, 47.
Otone IV, imperatore, III, 588, 589, 590, 800.
Otone, marchese aleramide, III, 199.
Ottomani, 264.