The highest royal title of the Dúnedain in Middle-earth, sometimes also seen in the form 'King of both Gondor and Arnor', that was given to the ruler of the combined North- and South-kingdoms.

Tolkien only ever uses this title to refer to Aragorn II, after he became King of the Reunited Kingdom, and it would presumably have passed on to his heir Eldarion and his descendants. It might also have been applied to Aragorn's distant ancestors Elendil and Isildur, both of whom had ruled the Two Kingdoms as High King of the Dúnedain long before Aragorn's time, but there is no record of either of them using the title.