The Turdetani of the Roman period are generally considered the heirs of the Tartessian culture. Strabo mentions that: "The Turdetanians are ranked as the wisest of the Iberians; and they make use of an alphabet, and possess records of their ancient history, poems, and laws written in verse that are six thousand years old, as they assert." It is not known when Tartessian ceased to be spoken, but Strabo (writing c. 7 BCE) records that "The Turdetanians ... and particularly those that live about the Baetis, have completely changed over to the Roman mode of life; with most of the populace not even remembering their own language any more."