Great mother Oya, have mercy on your children.

[Chovexani]

In Yoruba mythology, Oya (Alternative spellings: Oiá, Iansã, Iansan), is the Goddess of the Niger River. She is seen in aspects of warrior-goddess of wind, lightning, fertility, fire and magic. She creates hurricanes and tornadoes and guards the underworld<1>.

Her full name is Oya-Yansan, which means "mother of nine." In Brazil, in candomble she is generally saluted with the phrase "Èpa heyi!. while in Cuban-derived Yórùbá traditions, the faithful often salute her by saying "Hekua hey Yansa."

She is closely associated with many Orishas, but most especially Shango/Changó, Oggun, Oba (Obba), Yewá/Euá and Ochún/Oxum. Oyá is also called "the one who puts on pants to go to war" and "the one who grows a beard to go to war". As the Spirit of the Wind, Oya manifests in Creation in the forms as sudden and drastic change, strong storms, and the flash of the marketplace. Oya's representation of wind, creation, and death is not as arbitrary as it may seem. Oya has a sister named Ayao that is received by her initiates.

http://en.wikipedia.org/wiki/Oya