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.
They didn't much like obvious truths in the Dual Monarchy.
The dual monarchy dissipated any sense of allegiance to a single crown.
"Are you leader of the conspiracy to overthrow the Dual Monarchy?"