In 1400, Charles VI of France commissioned <i>Charter of the Court of Love </i>, which was a charter where on February 14th contests would be held related to love songs and poetry readings about love. While the story of this are not certain, what we do know is by the 15th century people did begin to wish their beloved valentine greetings. The Duke of Orléans, who was captured in battle against the English, wished his wife a sweet valentine. In England, Valentine's Day also began to be associated with gifts of sweets for children. In the 15th century, cards may have begun to be created with notes of affection, although they did not become popular until much later. By 1600, Shakespear's Hamlet has Ophelia discuss her love for Hamlet on Valentine's Day.
By the 17th centuries, Valentine's day began to be popular among friends and lovers among different classes. At this point, people began to exchange tokens of affection and notes with each other expressing their feelings.
It was around 1900 that Valentine cards were popularly produced throughout Europe and began to replace letters and notes that lovers would exchange. Valentine cards often contained secret compartments that the women of affection would have to find, which may have contained additional messages.