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Discordianism is a paradigm based upon the book the Principia Discordia, written by Greg Hill with Kerry Wendell Thornley in 1963, the two working under the pseudonyms Malaclypse the Younger and Omar Khayyam Ravenhurst. According to its primary historian (Adam Gorightly) Discordianism was founded as a parody religion. Many outside observers still regard Discordianism as a parody religion although some of its adherents utilize it as a legitimate religion, or a metaphor for a governing philosophy.

The Principia Discordia, if read literally, encourages the worship of Eris, a.k.a. Discordia, the Goddess of chaos, or archetypes and or ideals associated with her. The Principia Discordia holds three core principles: the Aneristic Principle (order), the Eristic Principle (disorder) and the notion that both are mere illusions. It is only by rejecting these principles that you can truly perceive reality.

It is difficult to estimate the number of Discordians because they are not required to hold Discordianism as their only belief system, and because there is an encouragement to form schisms and cabals.

The foundational document of Discordianism is the Principia Discordia, fourth edition, written by Malaclypse the Younger, an alias of Greg Hill. The Principia Discordia often hints that Discordianism was founded as a dialectic antithesis to more popular religions based on order, although the rhetoric throughout the book describes chaos as a much more underlying impulse of the universe. This may have been done with the intention of merely "balancing out" the creative forces of order and disorder, but the focus is on the more disorderly aspects of the world – at times the forces of order are even vilified.

In discordian mythology, Aneris is described as the sister of Eris a.k.a. Discordia. Whereas Eris/Discordia is the Goddess of Disorder and Being, Aneris/Harmonia is the Goddess of Order and Non-Being.

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