Trumbić was born in Austro-Hungarian province of Dalmatia and studied law at Zagreb, Vienna and Graz (with doctorate in 1890). He practised as a lawyer, and then, from 1905 as the city mayor of Split. Trumbić was in favor of moderate reforms in Austro-Hungarian Slavic provinces. At the same time separatist and pan-Slavist movements were troubling politics in Serbia.
At the Versailles conference after World War I, Trumbić had to represent Yugoslav concerns in the face of Italian territorial ambitions in Dalmatia (temporarily settled in 1920, but raised again with Benito Mussolini). Trumbic resigned as Foreign Minister in 1920, as Serbian domination became the policy in the kingdom that was to have represented all the minority interests among South Slavs.
AnteTrumbic (1864-1938), the Croatian nationalist leader, was born in Austro-Hungarian Dalmatia on 17 May1864.
Further, Trumbic's group worked to convince Nikola Pasic's Serbian government to sponsor the notion of a union of the Croats, Slovenes and Slavs, an idea regarded with great mistrust by Pasic who remained intent upon the simple expansion of Serbia via territorial gains from a beaten Austro-Hungarian empire.
Trumbic resigned as Foreign Minister in 1920, as Serbian domination became the policy in the kingdom that was to have represented all the minority interests among South Slavs.
By 1929, when King Alexander I abrogated the constitution to establish a royal dictatorship, Trumbic was in retirement in Zagreb.