king consort

noun2

1. •
   The husband of a queen regnant who is given the title of king as a courtesy title, but does not rule in his own right.

   • It is also worth an aside here and noting that when Mary Queen of Scots married François, the French Dauphin in April 1558, he likewise became king consort of Scotland. — 1998
2. •
   (rare) The husband of a reigning king.

   • He jumped as trumpeters announced the arrival of the king and his king consort. — 2013