Portia is the heroine of which Shakespeare play?

I believe she also disguises herself as a lawyer and tells Shylock (not too sure of my spelling!) that he can have his pound of flesh, but not a drop of blood can be spilled in obtaining it. This is what ruins him.

I've not heard of the play tfgrjr

like me most important life is good.life..is.mast.life.love.book.

I read this book in high school!