co·rul·er | \ (ˌ)kō-ˈrü-lər 
\
\variants:
or co-ruler
plural corulers or co-rulers
Definition of coruler
: someone who rules with another
… they deposed him and put in his place his son, Stephen Dushan, who had until then served as coruler.— Cyril E. Black Such was the royal ardor that it took guilt over the death of his wife and co-ruler Queen Mary to end the affair.— Martin Rubin
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Time Traveler for coruler
The first known use of coruler was in 1677
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