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'm the source of all emotion but I'm caged in a white prison.
I tell people to be careful when handling boxes.
I am the word that has three syllables and twenty six letters. What am I?
Break me and I am better, immediately set and harder to be broken again. What am I?
A little house full of meat, no door to go in and eat.