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| Ancient Italy—Istria formed part of Region X (Venetia et Histria) from 12 BC to 568 AD |
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| Kingdom of Italy (Green), 480 AD Istria and Dalmatia belonged to Italy |
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| Kingdom of Italy, 480 AD Istria and Dalmatia belonged to Italy |
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| Kingdom of Italy, 526 AD Istria and Dalmatia belonged to Italy |
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| Roman Prefecture of Italy, 553 AD Istria and Julian Venetia belonged to Italy |
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| Kingdom of Italy and Exarchate of Italy, 600 AD Istria and Dalmatia belonged to Italy |
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| Kingdom of Italy, 843 AD Istria and Julian Venetia belonged to Italy |
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| Kingdom of Italy, 876 AD Istria and Julian Venetia belonged to Italy |
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| Kingdom of Italy (Yellow), 888 AD Istria and Julian Venetia belonged to Italy |
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| Italian States, 12th century Istria, Julian Venetia, the Quarnero and Dalmatian islands were linked to Italy |
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| Italian States, 1454 Istria and Dalmatia were linked to Italy |
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| Italian States, 1494 Istria and Dalmatia were linked to Italy |
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| Republic of Venice (Light Blue), 1509 The Doge of Venice was Duke of Dalmatia (Dux Dalmatiae) since 997 and Lord of All Istria (Totius Istriae Dominator) since 1150 |
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| Italian States, 1796 Istria and Dalmatia were linked to Italy |
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| Italian States, 1796 Istria and Dalmatia were linked to Italy |
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| Republic of Venice, 1796 Istria and Dalmatia belonged to Venice until 1797 |
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| Italian States, 18th century Istria and Dalmatia were linked to Italy |
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| Kingdom of Italy, 1807 (Yellow) Istria and Dalmatia belonged to Italy again in 1805-1809 |
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| Italian Region of Julian Venetia (Red) Annexed by Yugoslavia in 1947 |
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| The Natural Borders of Italy Closed in by the Alps |
