The origins of the tradition of the wedding cake date back to medieval times, when each guest at a wedding was supposed to bring a small cake, the cakes would be stacked on the table in levels and layers (If the bride and groom were able to kiss over the top of the stack it was considered good luck). These cake stacks would eventually merge into one cake and evolve into the modern wedding cake. Sweets are traditional at many celebrations for most if not all cultures worldwide. Ancient Roman records detail sweets distributed at weddings. The book Folklore Myths and Legends of Britain details the ancient Roman practice of dropping a wedding cake on the head of the bride. Medieval and Renaissance resources also mention large cakes at weddings. Such cakes may have been fruitcake.
A classic form was commercially established in Britain and the United States in the early years of the twentieth century. An exceptionally large, rich fruit cake, as much as twelve inches in diameter and twenty pounds in weight, was used as a base for pillars supporting a similar but smaller cake. A third, still smaller cake layer was mounted on another set of pillars above that. The three tiers were each covered with hard white "royal" icing, which also was used for a characteristically formal decoration of piped icing. The whole was crowned with flowers, natural or in a variety of artificial materials, or a limited range of other appropriate ornamentation that might also adorn the sides. This form traveled widely in the course of the twentieth century and was modified locally in relation to changing tastes and the development of new decorative potentials and uses. Though the classic form was especially tenacious in Britain, the knowledge of alternatives, contributed by different European traditions, spread with increasing rapidity.
A large cake can take a long time to make, and without modern refrigeration, a heavy fat and sugar frosting may have prevented spoilage by limiting moisture exposure. Another possibility is the use of sugar and fat required satisfying the need for conspicuous consumption for the families involved in the wedding.
The tiered design of the wedding cake originates from the tiered spire of a well known medieval church in London, England, called St Mary-le-Bow.
Henry VIII of England enacted a law specifying the quantity of sugar a cake may have, possibly to control or tax this prevailing convention.
During World War II, sugar was rationed in Great Britain, so icing could not be made, and cakes were reduced in size. To overcome this cakes were often served inside a box, which had been decorated with plaster of Paris, to resemble a larger, traditional cake.