Citrus fruit trees first became known when they left there original home in the tropical rain forests of China. The first orange was known as the sour orange, and together with the lime and the lemon were introduced to the Middle East by Arab traders.

The trees and fruit were popular and soon orange trees were found all over the Middle East and along the northern coast of Africa and Southern Europe, in places such as Spain. The sweet orange was only discovered in the 15th century when Vasco da Gama was presented with a large quantity when he visited Mombasa on the East Coast of Africa. [More]