The three-hundred-and-first Folkmoot of Judgment was the trial of Húrin Thalion in Brethil at the end of his imprisonment, held and ordered by Hardang, Chieftain of the Haladin. It took place in the fourth century of the First Age (years after his son Túrin's death).
It was at this trial that Hardang, sitting upon the Angbor (the "Doom-rock") alongside men of his household, would carry out a verdict of judgment on Húrin for his recent wrongdoings. An assembly of nearly a thousand folk were present.
Húrin's charges were having wounding the Chieftain Hardang's head in his household with a stool, for being outwardly ungrateful to the company of guards that found him in Haudh-en-Elleth by spitting food they had given him, as reported by Avranc, and for having the overall evil intent of coming into Brethil so as to kill Hardang at the bidding of Angband, from where Húrin was known to have come. Manthor, the Master of the Northmarch who had found Húrin at Haudh-en-Elleth a few days prior and befriended him during Húrin's imprisonment, was his defendant.
Over the course of the moot, Manthor holds a long debate with Avranc and Hardang, presenting true cases against the charge of Húrin's ungratefulness and against his intent to slay him. By the end, Húrin speaks of the circumstance of his errand in Brethil, involving the fact that Túrin Turambar, Nienor, and Morwen, his children and wife, had died there; and he turns the hearts of roughly half of the assembled folk against Hardang. A schism of the assembly results, and a violent revolt breaks out. The Hall of the Haladin is burned, out of which Hardang and Avranc make an escape moments before before Hardang is speared from behind, and dies.