A person accused of a crime could deny the charge by denying it on oath and finding a certain number of persons prepared to go on oath that they believed his or her own oath, a system known as compurgation. The number of persons required to swear depended on the gravity of the alleged crime; for example denying a homicide could require 300 compurgators, while if a woman accused a man of rape, the man would have to find 50 men prepared to swear to his innocence. For lesser crimes a smaller number would be sufficient. Witnesses could also be called, including eyewitnesses of the crime ("gwybyddiaid"). A witness who has once been proved to have given false testimony on oath was barred from ever appearing as a witness again.