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Ubar, a name of a region or a name of a people, was mentioned in ancient records, and was spoken of in folk tales as a trading center of the Rub' al Khali desert in the southern part of the Arabian peninsula. It is estimated that it lasted from about 3000 BC to the 1st century AD. According to legends, it became fabulously wealthy from trade between the coastal regions and the population centers of the Arabian peninsula and Europe. The region became lost to modern history, and was thought to be only a figment of mythical tales. Some confusion exists about the word "Ubar". In classical texts and arabic historical sources, Ubar refers to a region and a group of people, not to a specific town. Ptolemy's 2nd century map of the area shows "Iobaritae". It was only the late Medieval version of The One Thousand and One Nights, in the fourteenth or 15th century, that romanticized Ubar and turned it into a city rather than a region or a people.