His Destiny With Fëanor
When Melkor's sentence in chains had been served, he was released and then sought to take revenge by turning the Noldor against the Valar and against each other. Fëanor, although he did not trust Melkor, was entangled in his lies and began to speak of rebelling against the Valar. This caused unrest in Tirion, so Finwë summoned all of his lords to council. Fingolfin came first and warned his father of Fëanor's growing influence and threat to his reign. Fëanor, who arrived soon enough to hear this, was infuriated and drew his sword on his brother, saying, "Get thee gone, and take thy due place!" Fingolfin bowed to his father, without paying any heed to the threat from his brother, and departed. Fëanor followed him to the door of the king's house and held the tip of the sword to his brother's chest, and said, "See half-brother! This is sharper than thy tongue. Try but once to usurp my place and the love of my father, and maybe it will rid the Noldor of one who seeks to be the master of thralls." This proclamation was heard by man who were around, but Fingolfin answered not and passed through the crowd, in search of Finarfin.
The Valar punished Fëanor with a twelve-year banishment from Tirion. Fingolfin offered pardon from the sentence, "I will release my brother", but Fëanor remained silent and left. Finwë left Tirion with his firstborn son and Fingolfin became the lord of Tirion. Fëanor was later invited to a great feast, marked by the ripening of the fruits of the Trees, to honor Eru. There, he met Fingolfin again, who reminded him of his offer, "As I promised, I do now. I release thee, and remember no grievance." He then took Fëanor's hand and swore, "Half-brother in blood, full brother in heart I will be. Thou shalt lead and I will follow. May no grief divide us." To this, Fëanor replied, "I hear thee. So be it."
With the slaying Finwë and the sacking of the Silmarils, Fingolfined maintain his promise to Fëanor, hesistantly, to follow Morgoth and reclaim both the Silmarils and honor. Finarfin joined Fingolfin, and the three brothers lead the Noldor on a journey out of the Blessed Realm. They saved Fëanor's host at Alqualondë, in the Kinslaying and the plight over the white ships of the Teleri.