http://mathworld.i2p/DidosProblem.html
The problem is based on a passage from Virgil's Aeneid : "The Kingdom you see is Carthage, the Tyrians, the town of Agenor; But the country around is Libya, no folk to meet in war. Dido, who left the city of Tyre to escape her brother, Rules here--a long and labyrinthine tale of wrong Is hers, but I will touch on its salient points in order....Dido, in great disquiet, organised her friends for escape.