Imrazôr was the father of the first Lord of Dol Amroth, Galador. From him were descended the Princes of Dol Amroth, including Imrahil who fought with Aragorn during the War of the Ring.

The folk of that bloodline held it to be true that Imrazôr wed a companion of Nimrodel named Mithrellas, and it was she who gave birth to their son Galador.

In that way, the Princes of Dol Amroth claim for themselves a measure of Elven blood, though it is never said for certain if that was true or simply legend.
Encyclopedia entry originally written by ~Venora~