The camel is believed to have been domesticated in the Horn region sometime between the 2nd and 3rd millennium BCE. From there, it spread to Egypt and the Maghreb. During the classical period, the northern Barbara city-states of Mosylon, Opone, Mundus, Isis, Malao, Avalites, Essina, Nikon, and Sarapion developed a lucrative trade network, connecting with merchants from Ptolemaic Egypt, Ancient Greece, Phoenicia, Parthian Persia, Saba, the Nabataean Kingdom, and the Roman Empire. They used the ancient Somali maritime vessel known as the ''beden'' to transport their cargo.