Arod, Shadowfax and Hasufel
‘There is more than one horse coming,’ said Aragorn.
. . . ‘There are three,’ said Legolas, gazing out over the plain.
. . . ‘There is Hasufel, and there is my friend Arod beside him! But there is another that strides ahead; a very great horse . . . I have not seen his like before.’
‘Nor will you again,’ said Gandalf. ‘That is shadowfax.’
The Two Towers