Haleth was the daughter of Haldad of the Haladin, who led her people westward across Beleriand and founded the settlement of Men in the Forest of Brethil. After her death, the People of Haleth - as they had become known - raised a barrow for her in the Forest. It was known as Tûr Haretha, the Ladybarrow, or Haudh-en-Arwen.
Haudh-en-Arwen had no direct connection with Arwen Evenstar, who lived millennia after Haleth's time, but it does give an insight into the origin of her name. Sindarin arwen means literally 'high maiden', and is translated here as the 'lady' in 'Ladybarrow'.