In Irish mythology and folklore, there are three tales about the lake's origins. One says that it is named after a mythical woman named Erne, Queen Méabh's lady-in-waiting at Cruachan. Erne and her maidens were frightened away from Cruachan when a fearsome giant emerged from the cave of Oweynagat. They fled northward and drowned in a river or lake, their bodies dissolving to become Lough Erne. Patricia Monaghan notes that "The drowning of a goddess in a river is common in Irish mythology and typically represents the dissolving of her divine power into the water, which then gives life to the land". Another tale says that it was formed when a magical spring-well overflowed, similar to the tale of Lough Neagh. The third says that, during a battle between the Érainn and the army of High King Fíachu Labrainne, it burst from the ground and drowned the Érainn. In "Cath Maige Tuired" ("the Battle of Moytura"), it is listed as one of the twelve chief loughs of Ireland. Historically, the lake was also called "Loch Saimer" ("Samhaoir"). Folklore says that Partholón killed his wife's favourite hound—Saimer—in a fit of jealous rage, and the lake was named after it.