King of Gondor and Arnor

				Elendil
			Isildur		Anárion
Elendur	Aratan	Ciryon	Valandil		Three unnamed children			Meneldil
			Kings of Arnor					Kings of Gondor
		Kings of Arthedain	Kings of Cardolan	Kings of Rhudaur
		Chieftains of the Dúnedain
		Aragorn Elessar
		Eldarion
		Further Kings

This chart shows the names of all the Kings who ruled both Gondor and Arnor in bold text.

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, 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.

For a list of known rulers of both Gondor and Arnor, see the entry for High King.