Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In Greek mythology, the Keres were female death-spirits. The Keres were daughters of Nyx, and as such the sisters of Fate, Doom, Death and Sleep, Strife, Old Age, Divine Retribution, Charon, and other personifications. Some, such as Cicero who calls them by a Latin name, Tenebrae, or the Darknesses, name them daughters of Erebus and Nyx. The term Keres has also been cautiously used to describe a person s fate. An example of this can be found in the Iliad where Achilles was given the choice between either a long and obscure life and home, or death at Troy and everlasting glory. Also, when Achilles and Hector were about to engage in a fight to the death, the god Zeus weighed both warrior's keres to determine who shall die.