Columbia subject headings:
Harvard subject headings:
Galba, Servius Sulpicius, Emperor of Rome, 3 B.C.- 69 A.D.
Otho, Marcus Salvius, Emperor of Rome, 32-69.
Rome--History--Civil war, 68-69.
Vitellius, Aulus, Emperor of Rome, 15-69.
Princeton subject headings:
Galba, Servius Sulpicius, Emperor of Rome, 3 B.C.-69 A.D.
Otho, Marcus Salvius, Emperor of Rome, 32-69.
Rome--History--Civil War, 68-69.
Vitellius, Aulus, Emperor of Rome, 15-69.