Crucifixion is a way to execute (kill) someone, usually because they have committed a crime. It was used as a capital punishment by the government of Rome. A prisoner was beaten with whips, and made to carry their own cross. They were either tied or nailed to the cross. The Romans used different types of crosses: T-shaped, X-shaped, and sometimes just trees. It killed people by making them bleed, go into shock, and making it hard for them to breathe, eventually dying of suffocation. Some of the people would live for several days before dying. The Roman soldiers (which were like the police of that time) would often break the legs of the criminal to speed it up.