Glorfindel and Asfaloth

This is the mighty Elf-lord Glorfindel riding his white horse Asfaloth.

Despite what Peter Jackson has shown us, it was Glorfindel that helped Frodo Baggins and his companions reach the house of Elrond and evade the pursuit of the Black Riders after Frodo was stabbed with a Morgul-blade.

"Suddenly into view below came a white horse, gleaming in the shadows, running swiftly. In the dusk its headstall flickered and flashed, as if it were studded with gems like living stars. The rider’s cloak streamed behind him, and his hood was thrown back; his golden hair flowed shimmering in the wind of his speed.... it appeared that white light was shining through the form and raiment of the rider, as if though through a thin veil."  —The Fellowship of the Ring