نایب‌السلطنه

Also known as regentess

upright=1.35|thumb|16th century Swedish regent Sten Sture the Younger|Stenonis Sture and wife [[Christina Gyllenstierna who both operated in strong resistance to Danish rule during the Kalmar Union]] upright=1.35|thumb|The oath of the provisional triumvirate|triumviral regents of the [[Empire of Brazil on behalf of the 5-year-old Emperor Pedro II in 1831, at the beginning of the Regency period.]] In a monarchy, a regent () is a person appointed to execute the office of a monarch temporarily, essentially as a substitute ruler. Regencies may arise for a number of reasons, including the monarch b