From Avacal Wiki
The member of a reigning couple who fought in and won the tournament which determined their royal status.
Definition from Kingdom Law
Typically, there is little need to specify which of a royal couple is the Sovereign and which is the Consort; they rule together as a unit. There are a few additional duties for the Sovereign and these are defined in Kingdom Law (generally, in articles concerning Crown Lists and the Crown Prince and Crown Princess).
See also: Consort, and Inspiration