lex regia

Etymology
Literally, “(the) royal law”. The process by which the term came to refer to the definitive transfer of authority from the Roman people to the emperor is : although  uses the term in describing the emergence of the principate, it is unclear whether he intended it specifically or in the generic sense of a royal law; it has also been argued that its appearance in Ulpian is a later  interpolation. The particular sense was established by the time of the  of (529–34).

Noun

 * 1)  One of a group of ancient laws attributed to the.
 * 2)  The irrevocable transfer of supreme power from the Roman people to the emperor, the basis of secular monarchy.
 * 1)  The irrevocable transfer of supreme power from the Roman people to the emperor, the basis of secular monarchy.