Vitellius Caesar.

Ninth of the Caesars.

Period of principate.

Related and attributed text(s).
Tacitus, Histories 2-3 (related), available in Latin (Latin Library) and English (Internet Classics Library).
Suetonius, Vitellius (related), available in Latin and English (LacusCurtius).
Cassius Dio, Roman History (related), available in English (LacusCurtius).

Useful links.
Vitellius at Wikipedia.
Vitellius at Roman Emperors.

Vitellius Caesar was the ninth of the twelve Caesars for whom Suetonius wrote a biography. He was the third of the emperors in 69, the notorious year of the four emperors.