Gaius Gracchus, Tribune of the Plebs (tenor)

Publius Argenteus, leader of the senatorial faction of the Optimates and adversary of Gaius (bass)

Licinia, wife of Gaius Gracchus (lyric soprano)

Cornelia Africana, mother of the Gracchi (mezzo soprano)

Tiberius Paulus, little son of Gaius and Licinia (soprano) *

Marcus Prudens, leader of the senatorial faction of the Populares, Principal Speaker of the Senate, and friend of Gaius (baritone) †

Ghost of Tiberius Gracchus, murdered older brother of Gaius (baritone) †

Blossius, a philosopher (tenor) **

The Cumaean Sibyl, Oracle of Apollo (coloratura soprano)

Fatuus, a busker (soprano) *

Loquax Torculus, a wine vendor (tenor) **

Servant of Publius (tenor) **

Metellus Gladius, Publius’s henchman (bass) ‡

Captain of the Urban Cohort (bass) ‡

The Mob (chorus)

Lads and Lasses (dancers)

* the two roles may be sung by one soprano

** the three roles may be sung by one tenor

† the two roles may be sung by one baritone

‡ the two roles may be sung by one bass