Uinen, the Lady of the Seas, is one of the Maiar of Ulmo and spouse to Ossë. Ulmo gave her and Ossë government of the waves and movements of the Inner Seas.

Uinen is a lover of all creatures and weeds that flourish in the salt streams. Mariners cry to her for she can lay calm upon the waves, restraining the wildness of Ossë.

She was held in reverence equal to the Valar by the Númenóreans and they lived long in her protection.

At the request of Aulë she restrained Ossë and brought him before Ulmo to beg pardon for his previous alliance with Melkor.

She and Ossë befriended the Teleri who dwelt on the shores of Beleriand, and she wept for them during the Kinslaying at Alqualondë for the Valar did not permit her or Ossë to interfere with the flight of the Noldor.
Encyclopedia entry originally written by Arien