["Nations and Nationalism, Volume 27, Issue 1, Page 174-188, January 2021. ", "\nAbstract\nIn the 1848–1867 period, the Habsburg Monarchy was shaken by the first waves of nationalism. Yet in the case of the Habsburg port cities of Fiume/Rijeka and Trieste, contended by several different opponents, Italian and Croatian nationalisms had to face centuries‐long traditions of municipal autonomy. In both cities, municipalism and attachment to the House of Habsburg were particularly strong and were coupled with local urban identities that defied national forms of identifications, insofar as they were ethnically and linguistically hybrid. Nationalist activists sought to exploit ethnic and linguistic elements as markers of defined national identities, yet without widespread success. The final demise of the Habsburg Monarchy in 1918 has been generally taken as proof of the cogency of nationalist discourse, especially the Italian, in the region. However, the northern Adriatic rim points to the forcefulness of Habsburg multinationalism and the existence of ethnic hybridity, which provided effective bulwarks against nationalisms for decades.\n"]