The western part of the duchy, with the towns of Postojna, Ilirska Bistrica, Idrija and Šturje was annexed to Italy in 1920, but was subsequently also included into Yugoslavia in 1947.
The western part of the duchy, with the towns of Postojna, Ilirska Bistrica, Idrija, Vipava and Šturje was annexed to Italy in 1920, but was subsequently also included into Yugoslavia in 1945.
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