[5] Cases in which two monarchs rule simultaneously over a single state, as is the current situation in Andorra, are known as coregencies.
Although they will be addressed differently in their local languages, the names and titles in the list below have been styled using the common English equivalent.
In political and sociocultural studies, monarchies are normally associated with hereditary rule; most monarchs, in both historical and contemporary contexts, have been born and raised within a royal family.
[6][8] Succession has been defined using a variety of distinct formulae, such as proximity of blood, primogeniture, and agnatic seniority.
[9] These systems defy the model concept of a monarchy, but are commonly considered as such because they retain certain associative characteristics.