The capital of the ancient Carthaginian Empire was founded by the Phoenicians (city-state of Tyros) in 814 B.C. twelve kilometres north of Tunis as a trading colony (according to Greek mythology by the female legendary figure Dido). They also brought viticulture here and the Carthaginians adopted their knowledge. Around the city there were flourishing vineyards. The Greek historian Diodorus Siculus (90-21 B.C.) describes the Carthaginian landscape in the fourth century B.C. full of vines and olives, especially in the Bagradas valley and in the south of today's Tunisia. The Punic writer Mago (2nd century BC) wrote the 26-volume work "De re rustica" in the Punic language about agriculture, including viticulture, which is no longer preserved but is often quoted by later authors. The Roman historian Tacitus (55-120) reports in his annals of a Carthaginian wine made from dried grapes.