History of the star: [Although figured as alpha it is not the brightest star in the constellation, there are actually ten brighter stars in Sagittarius. ] Rukbat is from Arabic Ar-Rukbah (1), "The knee" of the Archer Sagittarius. Variously written Rucba, and Rucbar, from Ulug Beg's Rukbat al Rami, "the Archer's Knee"; in some early books it is Al Rami, the Archer himself. The Standard Dictionary has Ruchbar ur Ranich.

This star, alpha, and the two betas were known as Al Suradain, the two Surad, desert birds differently described, — by some as "larger than sparrows" and variegated black and white (magpies?); by others as yellow and larger than doves.

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

The astrological influences of the constellation: The Archer is associated with the Hebrew letter Vau and the 6th Tarot Trump "The Lovers". (Fixed Stars and Constellations in Astrology , Vivian E. Robson, 1923)

The astrological influences of the constellation given by Manilius:

"As for the Archer, when the foremost portion of his cloak rises, he will give birth to hearts renowned in war and will conduct the conqueror, celebrating great triumphs in the sight of all, to his country's citadels. Such a one will build high walls (moenia from Latin murus) one moment and pull them down the next. But if Fortune favours them too generously with success, the mark of her envy is to be seen on their faces, for she works cruel havoc upon their features. So was it that a dread warrior^* paid for his victories at the Trebia, Cannae, and the Lake, even before the hour of his retreat, with such disfigurement." [Translator's note: *Hanibal who lost an eye (Livy 22.2.11: Sagittarius is one-eyed; see p.103) [Manilius, Astronomica, 1st century AD, book 4, p.267]

But they whose lot it is to be born under the Centaur of double form delight in yoking a team, in bringing a fiery horse to obey the pliant reins, in following herds which graze all over the grasslands, and in imposing a master on every kind of quadruped and taming them: they soften tigers, rid the lion of his fierceness, speak to the elephant and through speech adapt its huge bulk to human skills in a variety of displays. Indeed, in the stars of this constellation the human form is blended with a beast's and placed above it; wherefore it has lordship over beasts. And because it carries a shaft poised on drawn bow, it imparts strength to limb and keenness to the intellect, swiftness of movement, and an indefatigable spirit. [Manilius, Astronomica, 1st century AD, book 4, p.241.]