Demetrius the Chronographer and 141 BCE

We only have six fragments from a book written by Demetrius the Chronographer. Scholars claim he lived and worked in Alexandria about 225-200 BCE and he is an early witness for the date of the LXX. However, the few chronological details we have indicate that he used the year 141 BCE as the base year for his chronology. There are no early witnesses for the LXX and there are no reliable obstacles for lowering the date for the LXX to 130 B.C. or even lower.