Patriarch and Matriarch

The head (male or female) of a noble house.

After the Dissolution of Kingdoms, noble estates become unchangeable, meaning that estates can no longer be split or joined. Thus, each official noble house (registered in the Registry of Aristocratic Names) has only a single head.

The head of the ruling house of a city-state is referred to as the sovereign; the titles vary depending on charters of the city-state.

House heads who relinquish their position in favor of an heir may (for a price) join the Senate.