I think it's best if you read it again so I can make sense.
Answer:
To prove the law wrong about slaves
Explanation:
Well, that is upsetting. I hope she feels better. Lmao
The word before is a preposition
Viola has been shipwrecked in a violent storm off the coast of Illyria; in the process she has lost her twin brother, Sebastian. She disguises herself as a boy and assumes the name Cesario for protection. Thus disguised, Viola becomes a page in the service of Orsino, the Duke.