From The Lord of the Rings wiki
Celeborn
Celeborn is a noble Elf of the Sindar, the Lord of Lothlorien and the husband of Galadriel.
Background
Celeborn was a high-ranking Sindarin prince who dwelt in the woodland realm of Lothlorien alongside his wife, Galadriel. Often referred to as the Lord of the Galadhrim, he played a vital role in the defence of Middle-earth against the growing shadow of Sauron. His wisdom and foresight were instrumental in maintaining the peace of his forest kingdom for many centuries.
Role in the War of the Ring
During the quest to destroy the One Ring, Celeborn provided essential aid to the Fellowship of the Ring, including Frodo Baggins, Aragorn, Legolas Greenleaf, Gimli, and the other members of the party. He offered them shelter, supplies, and counsel after their perilous journey through the Mines of Moria. Following the defeat of the Dark Lord, Celeborn led his forces across the Anduin to dismantle the fortress of Dol Guldur, effectively cleansing Mirkwood of evil influence.
Legacy
Unlike many of his kin who departed for the Undying Lands early, Celeborn remained in Middle-earth for a significant period following the end of the Third Age. He eventually chose to sail into the West, leaving behind a legacy as one of the last great Elven lords to witness the transition of the world into the Age of Men.