History of the star: A star in the breast of The Swan Cygnus. Sadr, or As-Sadr (1), from Arabic Al Sadr al Dajajah, "the Hen's Breast".

Christians saw in Cygnus the Cross of Calvary, Christi Crux, or Crux cum S. Helena. This Cross is formed by alpha (Deneb Adige), gamma (this star Sador), eta, and beta (Albireo), marking the upright along the Galaxy, more than 20° in length, zeta, epsilon (Gienah), gamma this star, and delta being the transverse. Gamma marks the center of the Cross.

These last (zeta, epsilon (Gienah), gamma this star, and delta) also were an Arab asterism, Al Fawaris, "the Riders"; alpha and kappa sometimes being added to the group.

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

The astrological influences of the constellation: Cygnus gives a contemplative, dreamy, cultured and adaptable nature. The affections are ill regulated and unsteady, the talents develop late. There is some love of water and swimming and the arts. By the Kabalists it is associated with the Hebrew letter Resh and the 20^th Tarot Trump "Judgment". (Fixed Stars and Constellations in Astrology , Vivian E. Robson, 1923) 

The astrological influences of the constellation given by Manilius:

"Hard by is the place allotted to the Swan:  as a reward for the shape with which he [Jupiter or Zeus] snared the admiring Leda, when, a god changed into a snow-white swan, he came down and offered his feathered form to the unsuspecting woman. Now too with outspread wings it flies among the stars" [Manilius, Astronomica, 1st century AD, book 1, p.31.]

"Its down and glittering wings figured by stars. Accordingly he who at its rising leaves his mother's womb and beholds the light of day shall make the denizens of the air and the race of birds that is dedicated to heaven the source of his pleasure and profit.

"From this constellation shall flow a thousand human skills (artes): its child will declare war on heaven and catch a bird in mid-flight, or he will rob it of its nestling, or draw nets up and over a bird whilst it is perched on a branch or feeds on the ground (swans have a reputation for being hostile to other birds). And the object of these skills is to satisfy our high living. Today we go farther afield for the stomach than we used to go for war: we are fed from the shores of Numidia and the groves of Phasis; our markets are stocked from the land whence over a new-discovered sea was carried off the Golden Fleece. Nay more, such a man will impart to the birds of the air the language of men and what words mean; he will introduce them to a new kind of intercourse, teaching them the speech denied them by nature's law.

"In its own person the Swan hides a god (as being in the disguise of Jupiter) and the voice belonging to it; it is more than a bird and mutters to itself within. Fail not to mark the men who delight to feed the birds of Venus in pens on a rooftop, releasing them to their native skies or recalling them by special signs; or those who carry in cages throughout the city birds taught to obey words of command, men whose total wealth consists of a little sparrow (for such performing birds). [Manilius, Astronomica, 1st century AD, book 5, p.331].