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According to Dorium Maldovar and the Silence, the oldest and most dangerous question in the universe was "Doctor Who?" the Doctor's true name was apparently the answer; it could be used to open his grave on Trenzalore. Dorium claimed the Doctor had been running from the question all his life. According to the Silence, "silence must fall when the question is asked," because if the question was answered, the Doctor's timeline could be accessed and corrupted, which could in turn lead to the destruction of the universe by reversing all of the times the Doctor has saved it. (TV: "The Name of the Doctor", "The Wedding of River Song") At some point River Song learned his name, but the Doctor claimed there was only one reason he would ever reveal it. (TV: "Forest of the Dead")