It is often so with officials of the Dual Monarchy.
The oracle advised them to set up a dual monarchy.
A dual monarchy is not necessarily a personal union.
Austria-Hungary, a dual monarchy that existed from 1867 to 1918.
Denmark-Norway, a dual monarchy that existed from 1536 to 1814.
This made Budapest the twin capital of a dual monarchy.
The transition took place smoothly, and the dual monarchy of the youthful brothers began.
The dual monarchy dissipated any sense of allegiance to a single crown.
They didn't much like obvious truths in the Dual Monarchy.
"Are you leader of the conspiracy to overthrow the Dual Monarchy?"