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The Pre-Trial Master of Endurance was one of the three masters overseeing the Minotaur Pre-Trials which were part of Leiandros' scheme in the city of Lato in Pephka, Greece, during the 5th century BCE.
During the Peloponnesian War, the title was held by a woman overseeing the lake and the underwater cavern near Lato. As part of The Pre-Trial of Endurance, the woman tasked the Spartan misthios Kassandra to perform a Champion's Dive into the depths of the lake and retrieve her Trial Token of Endurance in a chest at its bottom.