Tar-Míriel was the name which Míriel should have taken when she ascended the throne to take her rightful place as the Queen of Númenor. But her first cousin took her to wife by force, and from her usurped the sceptre and the throne, becoming Ar-Pharazôn and changing her name to Ar-Zimraphel.
Encyclopedia entry originally written by Nienna-of-the-Valar