History of the star: A star in the middle of the northern Claw or scale of Libra.

[Star Names, Their Lore and Meaning, Richard Hinchley Allen, 1889] 

The two scales of Libra are marked by two stars which Bullinger (in The Witness of the Stars) called the Price of the Deficient (Zuben Algenubi) balanced by the Price which Covers (Zubenelschemali) and added "But there is a third star, gamma, below, towards Centaurus and the Victim slain (Lupus), telling, by that and by its name, of the conflict by which that redemption would be accomplished. It is called Zuben Akrabi or Zuben al Akrab, which means 'the price of the conflict!'" [Witness of the Stars, Ethelbert W. Bullinger, 1893] 

The astrological influences of the constellation: The Scales are associated with the Hebrew letter Heth and the 8th Tarot Trump "Justice". (Robson).

The astrological influences of the constellation given by Manilius:

"Balancing night with the length of day when after a year's space we enjoy the new vintage of the ripened grape, the Scales will bestow the employment of weights and measures and a son to emulate the talents of Palamedes, who first assigned numbers to things, and to these numbers names, fixed magnitudes, and individual symbols. He will also be acquainted with the tables of law, abstruse legal points, and words denoted by compendious signs; he will know what is permissible and the penalties incurred by doing what is forbidden; in his own house he is a people's magistrate holding lifelong office. Under no other sign would Servius [Servius Sulpicius Rufus, ca. 106-43 BC, extolled as the greatest of jurists by Cicero] more fittingly have been born, who in interpreting the law framed legislation of his own. Indeed, whatever stands in dispute and needs a ruling the pointer of the Balance will determine"  [Manilius, Astronomica, 1st century AD, book 4, p.239]