I. C. Filitti had an auspicious debut in diplomacy and politics, but his career was mired in controversy. A "Germanophile" by the start of World War I, he secretly opposed the pact between Romania and the Entente Powers, and opted to stay behind in German-occupied territory. He fell into disgrace for serving the collaborationist Lupu Kostaki as Prefect and head of the National Theater, although he eventually managed to overturn his death sentence for treason. Filitti became a recluse, focusing on his scholarship and press polemics, but was allowed to serve on the Legislative Council after 1926.