Naming of moons underworld, and Nix (a respelling of Nyx), mother of Charon, is the goddess of darkness and the night. Kerberos is a giant three-headed dog who guards the entrance to the underworld. The fifth moon is named for the river Styx that forms the boundary between the worlds of the living and the dead. The name of Eris's moon Dysnomia was suggested by its discoverer Michael E. Brown, who also suggested the name of the dwarf planet. The name has two meanings: in mythology Dysnomia (lawlessness) is the daughter of Eris (chaos). However, the name is also an intentional reference to
Rebellion of the Three Guards the Three Guards. Ji Kang, a famous author of the Three Kingdoms period, wrote an essay about Guanshu and Caishu, in which he argued that the rebellious brothers had "sincere reasons to doubt the wisdom" of Duke Dan's regency. As Cao loyalist he linked the Rebellion of the Three Guards with the Three Rebellions in Shouchun, regarding the rebels as duitiful men fighting against usurping regents (the Duke of Zhou and Sima Yi, respectively). Rebellion of the Three Guards The Rebellion of the Three Guards (), or less commonly the Wu Geng Rebellion, was a civil war, instigated by an