Note that many titles listed may also be used by lesser nobles – non-sovereigns – depending on the historical period and state. The sovereign titles listed below are grouped together into categories roughly according to their degree of dignity; these being: imperial (Emperor, Empress, etc.), high royal (King of Kings etc.), royal (King/Queen, sovereign Grand Duke or Grand Prince, etc.), others (sovereign Prince, sovereign Duke, etc.), and religious.
High royal titles
Princely, ducal, and other sovereign titles