The Romans entered Judean politics, ironically, by invitation of one Jewish faction that was in a power struggle with another. In 76 BCE Alexander Jannaeus, the last great king of the Hasmonean line, died. He was succeeded by his widow Salome Alexandra, who herself died in 67 BCE The royal couple’s two sons, Hyrcanus and Aristobulus, then fought each other for succession to the throne.
The so-called Letter of Aristeas or Letter to Philocrates  is a Hellenistic work of the second century BCE, one of the Pseudepigrapha. Josephus Flavius who rephrases some of the letter, ascribes it to Aristeas and written to Philocrates, describing the Greek translation of the Hebrew Law by seventy-two interpreters sent into Egypt from Jerusalem at the request of the librarian of Alexandria, resulting in the Septuagint translation.