Hador was the son of Hathol, and became the first Lord of Dor-lómin. Unlike his father and grandfather, Hador loved the elves and entered into the service of High King Fingolfin of the Noldor, swiftly becoming beloved of the king as had his ancestor Malach Aradan before him. Such was Hador’s devotion to his liege that Fingolfin gave him both the name Lórindol for his golden hair and a fiefdom in Dor-lómin, where his eldest son Fingon dwelt also. In honor of his ennoblement, Fingon gifted Hador with a mighty helm crafted by the dwarves, bearing a design of Glaurung the Golden and enchanted to protect its wearer and strike fear into the hearts of their enemies. Its strength and heaviness was such that few could wear it, but Hador was a powerful man who could bear its weight, and in his honor the helm was called the Dragon-helm of Dor-lómin and the Helm of Hador, becoming an heirloom that only the mightiest of his line could wear.
Hador was so great a warrior and so impressive a leader that his people were glad to follow him to their new land. His wife, Gildis, was a linguist eager to study the tongues of the elves, and was the first to propose that the House of Marach be renamed the House of Hador for her husband’s bravery and charismatic leadership.
Gildis bore Hador three children: a daughter, Glóredhel, and two sons, Galdor and Gundor. Hador encouraged his children to foster friendships with the Haladin of Brethil, eventually leading to a great feast celebrating the union of the two Houses when Galdor and Glóredhel each wed children of the Chieftain of the House of Haleth. Gundor married a woman of his own House, and was still young when he and his father both perished in the Dagor Bragollach, defending Eithel Sirion alongside Fingolfin their king.