A man bound me with boards

One of my enemies ended my life, sapped my world-strength 
Afterward soaked me in water. 
Set me in sun, where soon I lost the hairs that I had. 
And then the hard knife-edge cut me, 
Fingers folded me and feather of bird traced 
All over my tawny surface with drops of delight. 
Then for trappings a man bound me with boards 
Bent hide over me, glossed me with gold so I glistened 
Wondrous in smooth work, wire-encircled. 
Say what I am called — useful to man. Mighty my name is, 
A help to heroes, and holy am I

10th-century riddle on the manufacture of vellum