Philosophical Works of Lucius Annaeus Seneca, Vol. 4

Now, indeed, since he wrote his Letters in the final years of his life, and we have no doubt that this book was written at least under Nero, when our author flourished in wealth and power.

Concerning Lucilius Junior, the prefect of Sicily, to whom he inscribed both the Letters and the books of Natural Questions, all is uncertain. We understand from the Natural Questions that the man was born in a humble place, was endowed with talent, learning, and virtue, was helped by Seneca, and was advanced to the honors which he held. The poem titled Aetna, formerly accustomed to be attributed to Corn. Severus, has been rightly restored to Lucilius Junior by Wernsdorf in the Poetae Latini Minores (our ed. T. III, p. 79). We shall provide more in the preface to the Letters of Seneca, where all these things will certainly find a more suitable place than here; for the name of Lucilius is in some way inseparable and indivisible from Seneca the letter-writer.