Otho Caesar.

Eighth of the Caesars.

Period of principate.

Related and attributed text(s).
Tacitus, Histories 1 (related), available in Latin (Latin Library) and English (Internet Classics Library).
Suetonius, Otho (related), available in Latin and English (LacusCurtius).
Cassius Dio, Roman History (related), available in English (LacusCurtius).

Useful links.
Otho at Wikipedia.
Otho at Roman Emperors.

Otho Caesar was the eighth of the twelve Caesars for whom Suetonius wrote a biography. He was the second of the emperors in 69, the notorious year of the four emperors.