Galba Caesar.

Seventh of the Caesars.

Period of principate.
68 to 69.

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

Useful links.
Galba at Wikipedia.
Galba at Roman Emperors.

Galba Caesar was the seventh of the twelve Caesars for whom Suetonius wrote a biography. He was the first of the emperors in 69, the notorious year of the four emperors.