The Crown of Gondor was a winged helmet worn by the Kings of Gondor. Eärnur was the last King who wore it before the days of the Ruling Stewards, and it was kept in the Houses of the Dead until the true Heir of Isildur, Aragorn, came and claimed it.

In the banner of Gondor, the Crown appears above the White Tree of Gondor along with seven five-pointed stars.
Encyclopedia entry originally written by Annúnagar