Tyolus is a being mentioned in the Book of Origin. He taught a message of warning to the people of the low planes (mortals), that they should "seek not wickedness among your neighbors, lest it find purchase in your own house."
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Dr. Daniel Jackson quoted this reference when the Ori warships demanded that the Milky Way fleet surrender. The cruisers responded by firing their weapons. (SG1: "Camelot")