Tiberius Caesar.

Third of the Caesars.

Period of principate.
14 to 37.

Related and attributed text(s).
Velleius Paterculus, Roman History, especially 2.94-131 (related), available in Latin and English (LacusCurtius).
Tacitus, Annals 1-6 (related), available in Latin (Latin Library) and English (Internet Classics Library).
Suetonius, Tiberius (related), available in Latin and English (LacusCurtius).
Cassius Dio, Roman History (related), available in English (LacusCurtius).

Useful links.
Tiberius at Wikipedia.
Tiberius at Roman Emperors.

Tiberius Caesar was the third of the twelve Caesars for whom Suetonius wrote a biography. He was emperor when Jesus embarked upon his ministry (refer to Luke 3.1).