トリエステ県
After the end of World War II, the Free Territory of Trieste was established as a free state on 15 September 1947. On 26 October 1954, Italy and Yugoslavia came to an understanding whereby the territory "de facto" was divided between the two states. "Zone A" of the free state became the new Province of Trieste and "Zone B" was to be administered by Yugoslavia. The Province of Trieste formally became a part of Italy on 11 October 1977, by the Treaty of Osimo.