Dual monarchy occurs when two separate kingdoms are ruled by the same monarch, follow the same foreign policy, exist in a customs union with each other, and have a combined military but are otherwise self-governing. The term is typically used to refer to Austria-Hungary, a dual monarchy that existed from 1867 to 1918 that spanned across parts of Central and Southern Europe, but applies to other dual monarchies such as the Kingdom of Nejd and Hejaz.
Dual monarchy occurs when two separate kingdoms are ruled by the same monarch, follow the same foreign policy, exist in a customs union with each other, and have a combined military but are otherwise self-governing. The term is typically used to refer to Austria-Hungary, a dual monarchy that existed from 1867 to 1918 that spanned across parts of Central and Southern Europe, but applies to other dual monarchies such as the Kingdom of Nejd and Hejaz.
Source: Wikipedia "Dual monarchy" · CC BY-SA 4.0
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