How did Joseph from the egpytain end up in jail?

Joesph, being a man of integrity and of good moral character refused to commit adultery with the wife of his master Potiphar. She then falsely accused him and he was thrown into prison without trial. This is recorded in chapter 39 of Genesis.
Joseph was sent to prison because he was falsely accused of rape. Joseph was the 11th of Jacob's 12 sons.