Riddle 55

I saw in a hall,
where men were drinking,
borne into the room,
four kinds of things :
a curious forest-tree ;
and twisted gold,
treasure cunningly bound ;
and of silver a piece ;
and a crucifix
of him who for us to heaven up
a ladder rear'd,
ere he of hell's inhabitants
the burgh burst open.
I of this tree can,
easily before men,
the nature say :
there was lime and oak,
and the hard yew,
and the yellow alder ;
to their lord they all are
useful together :
they have one name,
the wolf-head tree,
which the weapon oft awaited
for its lord,
an ornament in the hall,
a gold-hilted sword.
Now me this riddle's
answer show,
he who may presume
in words to say
how the wood is call'd.