Suetonius: The Lives of the Twelve Caesars, v1, 3 Oct 2007.
 

The Lives of The Twelve Caesars
By C. Suetonius Tranquillus;
To which are added,
His Lives of The Grammarians, Rhetoricians, and Poets.
The Translation of Alexander Thomson, M.D.
Revised and corrected by T.Forester, Esq., A.M.

The twelve Caesars are:

Caius Julius Caesar.
D. Octavius Caesar Augustus.
Tiberius Nero Caesar.
Caius Caesar Caligula.
Tiberius Claudius Drusus Caesar.
Nero Claudius Caesar.
Sergius Sulpicius Galba.
A. Salvius Otho.
Aulus Vitellius.
T. Flavius Vespasianus Augustus.
Titus Flavius Vespasianus Augustus.
Titus Flavius Domitianus