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In Europe, the custom of presenting particular anniversary presents dates back to the Middle Ages. Early in the 15th century, the list of anniversary presents was first noted; it was not until the 20th century that it underwent standardization. The list includes customary presents for every year of marriage, with particular materials and themes attached to each year. Since then, it has become a well-known custom to give gifts on anniversaries as a way to recognize and cherish a couple's marriage's accomplishments.