Belethoriel was born in 300th year of the First age, in Hithlum. His father Calafindë was among those who crossed Helcaraxe under the banners of Fingolfin and named his son as Elecarnë in the tongue of Noldor. Which he would be known as Carangil to the world. They had lived and prospered in the house they erected by Mithrim lake for 150 peaceful years. Since Angband was under siege when Belethoriel was born, -despite all advice- he undermined the might of Morgoth. Looked down at his relatives living elsewhere than Dor-Lomin and Hithlum. Undermined them foolishly.

On 155th year of his life, when he saw from a watchtower in Ered Wethrin, the rivers of fire and lava pouring into Ard-Galen, the scene taught him humility , and the dark fear of Balrogs taught him modesty. From then on he never underestimated his enemy. Then his father was killed in Ethel Sirion in the same battle and was soon joined by his mother a year later. Whom overcame by grief and left the world. And lastly when Rochallor, king's horse rode on the land for the last time and carried its  rider to a heroic death, he remained in utter darkness despite the starlight and the sun.

He did not forsake Hithlum untill the Nirnaeth Arnoediad but when hithlum and Dor-lomin sunk into the darkness and Fingon fell, he sought refuge in Gondolin with many of his kin. There he met with a young Anglachelm and became one of his masters in blade, but before the city fell his pupil had become an even greater swordsman than the tutor. In the short living bliss of the white city they were good friends.

After the fell of Gondolin and the War of Wrath, he strode within the breaking apart Beleriand. When he was fully convinced that he had his goodbye to all the sweet memories of the sunken realm, Belethoriel traveled to Lindon and served to King Gil-Galad. From then on he ever sought the most remote assignments and missions. Stayed in the wilds so long until he became disattached from his kin and the rules of their society. He forsook his names Elecarnë and Carangil and became known as the name of his sword, Belethoriel. The very blade which Anglachelm forged for him in the bliss of Gondolin. In the meanwhile he hardly had any chance to see the forger yet their friendship was adamant despite all. Some time after the fall of Gil-Galad he lived his life under the shades and forsook all memories of old.

Lastly he followed Glorfindel willingly into the breaking of Angmar. After the conquest and the retreat of its dark lord he remained in the land by Glorfindel’s wish. He remained there for long years and represented last spots of star light in the wasteland. And never returned to his home for so long since he was strayed from his friends and got captured by the enemy. And spent long, lightless years in the dungeons of yet another dark realm. Until the moment he was rescued by fellow Noldor of Vanimar, Anglachelm’s own house.