Citrus medica is characterized by its thick rind and small sections. Generally, it is eaten preserved or in bakery goods, such as fruitcakes. (The candied peel rather than the fruit is often used in cooking). The citron was the first of the citrus known to the Romans. In ancient time the fruit was never eaten (it began to be used in cooking by the early 2nd century), but its intense perfume was used, penetrating clothes to repel noxious insects.