Answer:
They took me from my mother's side where I was bravely bred and when to age I did become they did cut off my head. They gave to me some diet drink that often made me mad but it made peace between two kings and made two lovers glad.
I contain six letters minus one and you got twelve.
First I may be your servant's name; then your desires I may proclaim; And when your mortal life is over hold all your wealth within my power.
I am often sold by children entrepreneurs in summer time
To you, rude would I never be, though I flag my tongue for all to see. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.