History of the star: A yellow star in the head or mouth of the Lion Leo. The Arabians designated this as Al Ras al Asad al Janubiyyah, "the Southern Star in the Lion's Head". It was also called Algenubi which would be a shortened version of the above name.

With eta (Al jabhah), it was Al Ashfar, "the Eyebrows", near to which they lie on the Lion.

It marked the 14th ecliptic constellation of Babylonia, Rishu A., "the Head of the Lion". 

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

Robson (Fixed Stars and Constellations in Astrology) says it was called "He Who Rends". This star is near Ras Elased Borealis in the Lion's Head.  

The astrological influences of the constellation: The Lion is associated with the Hebrew letter Kaph and the 11th Tarot Trump "Strength". (Robson*).

The astrological influences of the constellation given by Manilius:

"Who can doubt the nature of the monstrous Lion, and the pursuits he prescribes for those born beneath his sign? The lion ever devises fresh fights and fresh warfare on animals, and lives on spoil and pillaging of flocks. The sons of the Lion are filled with the urge to adorn their proud portals with pelts and to hang up on their walls the captured prey, to bring the peace of terror to the woods, and to live upon plunder. There are those whose like bent is not checked by the city-gates, but they swagger about in the heart of the capital with droves of beasts ; they display mangled limbs at the shop-front, slaughter to meet the demands of luxury, and count it gain to kill. Their temper is equally prone to fitful wrath and ready withdrawal, and guileless are the sentiments of their honest hearts" [Manilius, Astronomica, 1st century AD, p.237.]

An appreciation for language and a power of expression. (Fixed Stars and Judicial Astrology, George Noonan, 1990).

Credited with properties such as conveying higher spiritual gifts of the Logos to those men who are able to conceive them. In primitive natives, this star may become a danger, if bound up with a poorly placed Saturn or Neptune, severe psychological depressions are indicated and possibly even suicide. In conjunction with a 'strongly' placed Mars, the Lion's Head will make for feverish diseases and if conjunct with Uranus, dangers of accidents are present. Bismarck had this fixed star positioned exactly conjunct his Ascendant; this fact as well as the part played by other configurations gave this chancellor his mental superiority. (Fixed Stars and Their Interpretation, Elsbeth Ebertin, 1923)

References

Fixed Stars and Constellations in Astrology