Voltaire was a Freemason. Benjamin Franklin was among those who initiated him into the secret society.
Voltaire Was A Freemason William Lawrence Sr Omnibit 8-31-19

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Voltaire was a Freemason. Benjamin Franklin was among those who initiated him into the secret society.
So was Frederick the Great. He was an admirer of Voltaire, and invited the French philosophe to Berlin. Frederick asked Voltaire to critique some of his own written work. They had a falling out, not over literature, but over Voltaire’s money scams and his interference in university politics. Frederick finally had to ask him to leave, which was as good as an order to expel the Frenchman from his kingdom.