Dennis, an eminent classical commentator, was born at Montreuil-sur-Mer, in Picardy, and acquired great skill in polite literature. He lived for a long time at Rome; and at his return to Paris was made royal professor of the Greek language. He died in 1572, aged 56, of pure grief at the death of his friend Ramus, who was murdered at the massacre on St Bartholomew's day. He wrote commentaries on Plautus, Lucretius, Cicero, and Horace, and other works. His commentary on Horace is more particularly esteemed.