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This secret society, founded at Yale University in 1832, counts multiple U.S. presidents among its members.
Difficulty: EasyDan Brown's novel "The Da Vinci Code" heavily features this supposedly ancient secret society protecting the bloodline of Jesus Christ.
Difficulty: MediumThis German theologian, author of the influential work True and Complete Preparation, is often credited with writing the Rosicrucian manifestos.
Difficulty: HardFounded in Bavaria in 1776 by Adam Weishaupt, this secret society aimed to promote Enlightenment ideals and oppose superstition.
Difficulty: EasyThis Italian secret society, active in the early 19th century, fought for Italian unification and against Austrian rule.
Difficulty: MediumThis 1782 Masonic congress in Germany attempted to settle disputes about Templar origins and resulted in the transformation of the Strict Observance.
Difficulty: HardThis medieval order of warrior monks, founded around 1119, protected Christian pilgrims traveling to the Holy Land.
Difficulty: EasyThis infamous Friday in October 1307 saw the mass arrest of Knights Templar across France on orders of King Philip IV.
Difficulty: Medium