Cyclopedia of Biblical, Theological and Ecclesiastical Literature 
( Ἔρις , Strife ), in Greek mythology, was the personification of Discord, the daughter, of Night. When the deities were merrily assembled at the wedding of Peleus and Thetis, Eris threw an apple among them, bearing the inscription "To the most beautiful." Juno, Venus, and Minerva claimed it. Had Jupiter decided in favor of one he would have incurred the bitter enmity of the others, and hence he refused to announce his opinion; therefore Paris was authorized to decide. Power and greatness, wisdom and fame, offered by the earnest goddesses, had no influence with him; for Venus promised him the most beautiful woman of Greece as a possession. That goddess therefore received the prize of beauty; Paris carried off Helena, the Trojan war was the result, and all the deities took a part in it: Juno and Minerva as enemies of the Trojans; Venus, Apollo, and Mars on the side of those against whom war was made.
The Nuttall Encyclopedia 
The Greek goddess of strife or discord, sowing the seeds thereof among the gods to begin with, which she has since continued to do among men.