A major moment in Iorga's European career took place in 1924, when he convened in Bucharest the first-ever International Congress of Byzantine Studies, attended by some of the leading experts in the field. He also began lecturing at Ramiro Ortiz's Italian Institute in Bucharest. Also then, Iorga was appointed Aggregate Professor by the University of Paris, received the honor of having foreign scholars lecturing at the Vălenii de Munte school, and published a number of scientific works and essays, such as: "Brève histoire des croissades" ("A Short History of the Crusades"), "Cărți reprezentative din viața omenirii" ("Books Significant for Mankind's Existence"), "România pitorească" ("Picturesque Romania") and a volume of addresses to the Romanian American community. In 1925, when he was elected a member of the Kraków Academy of Learning in Poland, Iorga gave conferences in various European countries, including Switzerland (where he spoke at a League of Nations assembly on the state of Romania's minorities). His bibliography for 1925 includes some 50 titles. Iorga also increased his personal fortune, constructing villas in two resort towns: in Sinaia (designer: Toma T. Socolescu) and, later, Mangalia. More controversial still was his decision to use excess funds from the International Congress to improve his Vălenii printing press.