Gethron

"...Morwen sent Túrin forth with two aged servants, bidding them find entry, if they could, into the kingdom of Doriath."

― Quenta Silmarillion, "Of Túrin Turambar"

These two "aged servants" are never named in The Silmarillion, but the Narn i Hîn Húrin has more to say about them, including their names: Gethron and Grithnir. These two had been young at the time of Hador Lórindol, when they had roamed far and wide throughout Beleriand.

In their old age, they remained in the service of the House of Hador, whose lord at that time was Hador's grandson Húrin. After Húrin failed to return from the Nirnaeth Arnoediad ("Battle of Unnumbered Tears"), his wife Morwen chose Gethron and Grithnir as guides for the young Túrin, to lead him out of the now dangerous land of Dor-lómin. It was Gethron who stood before Thingol in the halls of Menegroth and asked that Túrin be fostered by the King, so playing a small part in Turin's deadly fate.