Beren:

Beren was the son of Barahir. The first of the Secondborn to wed with one of the Eldar, Beren was sent on a quest to recover one of the Silmarils for King Thingol of Doriath in the First Age of the Sun. With the aid of Lúthien Tinúviel, he succeeded in the quest, and died when the Werewolf Carcharoth wounded him before being himself killed.

Lúthien however chose to die also, and so powerful was her song before Mandos, that he was moved to pity, which has never happened before or since, and granted both of them a second mortal life, after which they would die and leave the circles of the World as is the fate for Men.