An Ancient King

Note: The structure of this riddle is modeled after those written in old English, where alliteration takes center stage just as much as rhyme.

I am a giant, an ancient king

With many a jewel by my neck are hanging

Then a monster comes, a heartless thief.

The bite so bitter brings me grief.

It takes my treasure, my riches untold,

My rubies, my emeralds, my silver, my gold.

What am I?

Check Braingle.com for the answer.