There is a lake in one of the Galtee mountains where there is a great serpent chained to a rock, and he may be heard constantly crying out, “O Patrick, is the Luan, or Monday, long from us?” For when St. Patrick cast this serpent into the lake he bade him be chained to the rock till La-an-Luan (The Day of Judgment). But the serpent mistook the word, and thought the saint meant Luan, Monday.