Oronata, [3]

Otho, [32]

Otho, of Bavaria, [24]

Otho, the Great, [32]

Otho, the Illustrious, [32]–[33]–[37]

Othoni, [29]–[32]

Ottoman (o), [9]

Ovid, [140]

Pan, [120]

Pandira, [72]–[73]