He studied the folk songs and popular poetry of the Scandinavian countries in an extended tour in northern Europe.
Returning to France in 1830, he delivered a series of lectures on Scandinavian and early German poetry at the Athenaeum in Marseille.
[1] Moving to Paris, he taught at the Sorbonne, and became professor of the history of French literature at the Collège de France.
A journey in northern Africa (1841) was followed by a tour in Greece and Italy, in company with Prosper Mérimée, Jean de Witte and Charles Lenormant.
From this time he was occupied with his chief work, L'Histoire romaine à Rome (4 vols., 1861–1864), until his death at Pau.