From Adriatic: A Concert of Civilizations at the End of the Modern Age, by Robert D. Kaplan (Random House, 2022), Kindle pp. 160-162:
Rijeka—Fiume—was a place of conflicting sovereignties long before the 1940s. Beginning in the late fifteenth century, Rijeka was an important seaport of the Austrian Habsburg Empire, and after the establishment of the Austro-Hungarian Dual Monarchy in 1867 much of it came under the rule of Budapest, with new rail links connecting it deep into Central Europe. If Trieste is a fault zone, then Rijeka is the very border of that fault zone. In fact, following the First World War, ethnic conflicts among the urban population and the decision of foreign diplomats to hand over the city to the new Kingdom of the Serbs, Croats, and Slovenes led 9,000 ethnic-Italian legionnaires to establish the vaguely anarchist and Fascist “Regency of Carnaro” here. That lasted a year, until 1920, when the Treaty of Rapallo declared Fiume a free state under Italian rule. In 1924, it became part of Fascist Italy. Through it all, the drama between Slavs and Italians nearby on the Istrian peninsula became a microcosm of the drama between East and West; between the free West and the Communist East. Though, given the cruelty and general insensitivity of the Italians towards the Slavs, something not restricted to Mussolini’s Fascists, one side was not always and not necessarily morally superior to the other.
For example, I look up at the balconies in Rijeka and think immediately of the leader of the Italian Regency of Carnaro, Gabriele D’Annunzio (1863–1938), a name that emerges from time to time in conversations here as a vague and occasional background noise: mentioned quickly in passing, but rarely explained. D’Annunzio was a charismatic intellectual with a lust for power and adulation, who consequently loved balcony appearances. For him, the purpose of politics was to supply an arena for glory and the erection of the perfect state. In Fiume, in 1919, with the collapse of the Habsburg Empire and the city the object of rival claims and protracted negotiations by Italy and the new Yugoslav kingdom, D’Annunzio seized power at the head of the far-right legionnaire movement, itself supported by flaky youthful idealists. Though he didn’t last long, this romantic thinker stylistically paved the way for Mussolini: he was a warning against hazy ideas and intellectual conceit. For lofty themes, if not grounded in moderation and practicality, can be the enemy of healthy politics.