Marriage was made one of the seven great sacraments of the Church, and the breach of the marriage tie was one of the sins most severely punished. Adultery had been severely punished under the customary laws of the Franks, usually by the death of both parties with frightful tortures; and the Church added to the physical punishment inflicted by the civil law in this world the threat of eternal torments in the next. Nevertheless, according to the testimony of many who are satirists and of some who are not, it was the unmarried priest who was the most frequent offender. An anecdote will illustrate the prevailing looseness of clerical morals. Wace tells us that a sacristan of Saint-Ouen, in Rouen, fell in love with a lady who lived across the little river Robec. As he was stealing across to meet her one dark night, his foot slipped on the plank by which he was crossing the stream, and he tumbled therein and was drowned. A devil was just about to pitchfork his soul and carry it off when an angel appeared, contending that the sacristan had not yet committed the sin. The case was submitted to Duke Richard, who ordered that the soul should be returned to the body, and that he would then judge according to the sacristan's actions. Presto! it was done; and the monk, his ardor cooled by the ducking, went back to his abbey and confessed to the abbot. A popular proverb makes the story survive: "Sir monk, step lightly, and take good care when you cross the plank." Not only in the Church, but in the world, immorality was too common and too easily pardoned. It is significant that illegitimacy was the rule rather than the exception among the Norman dukes, and that William the Conqueror, himself illegitimate, was conspicuous in his age for marital fidelity. The moral theory of the Church was correct enough, however it failed in practice. Every precaution was taken--indeed, too many were taken--to prevent hasty and ill-assorted marriages. The banns had to be read three times in the church; the contracting parties must be of proper age; they must have the consent of parent or guardian; they must not be related within the degrees prohibited by the Church; they must not be bound by any previous vow of chastity or be guilty of any mortal sin.