Tartessos (Greek: Ταρτησσός) or Tartessus was a harbor city and surrounding culture on the south coast of the Iberian peninsula (in modern Andalusia, Spain), at the mouth of the Guadalquivir River. It appears in sources from Greece and the Near East starting in the middle of the first millennium BC, for example Herodotus, who describes it as beyond the Pillars of Heracles (Strait of Gibraltar). Roman authors tend to echo the earlier Greek sources, but from around the end of the millennium there are indications that the name Tartessos had fallen out of use, and the city may have been lost to flooding, though several authors attempt to identify it with cities of other names in the area. Archaeological discoveries in the region have built up a picture of a more widespread culture, identified as Tartessian.
Tartessos was an important and powerful harbor city during the Bronze Age. Isketerol, a native Tartessos merchant, realised from his stay on Nantucket Island that Tartessos in modern history has been lost in time, and only been vaguely known. This knowledge convinced Isketerol that he has an opportunity to change the future of his people.