Isis is a goddess in Ancient Egyptian religious beliefs, whose worship spread throughout the Greco-Roman world. She was worshipped as the ideal mother and wife as well as the patroness of nature and magic. She was the friend of slaves, sinners, artisans and the downtrodden, but she also listened to the prayers of the wealthy, maidens, aristocrats and rulers. Isis is often depicted as the mother of Horus, the hawk-headed god of war and protection. http://en.wikipedia.org/wiki/Isis
In the typical form of her myth, Isis was the first daughter of Geb, god of the Earth, and Nut, goddess of the Sky, and she was born on the fourth intercalary day. She married her brother, Osiris, and she conceived Horus with him. Isis was instrumental in the resurrection of Osiris when he was murdered by Set. Using her magical skills, she restored his body to life after having gathered the body parts that had been strewn about the earth by Set.
This myth became very important during the Greco-Roman period. For example it was believed that the Nile River flooded every year because of the tears of sorrow which Isis wept for Osiris. Osiris’s death and rebirth was relived each year through rituals. The worship of Isis eventually spread throughout the Greco-Roman world, continuing until the suppression of paganism in the Christian era. The popular motif of Isis suckling her son Horus, however, lived on in a Christianized context as the popular image of Mary suckling the infant son Jesus from the fifth century onward.