who is the barrow wight????

hey! i read the books, but there is one thing i don't remember. Who is the Barrow Wight? Tell me what was significant about him! [img]smilies/biggrin.gif[/img] [img]smilies/confused.gif[/img] [img]smilies/frown.gif[/img] [img]smilies/wink.gif[/img] [img]smilies/biggrin.gif[/img] [img]smilies/evil.gif[/img]