Glorfindel

Glorfindel is an Elf from J.R.R. Tolkien's The Lord of the Rings. He meets Aragorn and the Hobbits as they are fleeing from the Nazgul, and takes the critically wounded Frodo to Elrond at Rivendell. He rides a white horse named Asfaloth.

In The Movies his role (and horse) was given to Arwen. This caused ... displeasure ... to many members of the Tolkien Fandom.

A Glorfindel is known to have slain a Balrog centuries before the events of the Lord of the Rings. Whether or not it is the same Glorfindel is not known.