Dio Cassius. Roman History. Bks. 57-8.

Juvenal. Saturae. 10.

Lucan. De Bello Civili, a.k.a Pharsalia.

Martial. Epigrammaton.

Persius. Saturae.

Pliny the Elder. Naturalis Historia.

Seneca. Ad Marciam de Consolatione.

Seneca. De Beneficiis.

Suetonius. De Vita Caesarum. 'Tiberius.'

Tacitus. Annales. Read both in original Latin, and in English trans. by Richard Grenewey (1598).

REFERENCE : Philip J. Ayres, ed. Sejanus. The Revels Plays. Manchester: Manchester University Press, 1990. 10-16.