J.-J. Rousseau was among Voltaire’s multitude of correspondents; though he disapproved of Rousseau’s life, he was civil, and invited him to drink Swiss cows’ milk with him. Voltaire was one of Diderot and d’Alembert’s greatest supporters, writing several articles for their Encyclopédie. The mathematician du Châtelet became his lover and intellectual companion. Boswell, Gibbon, Smith and Casanova all visited him; he misunderstood Congreve’s reticence, and visited Pope at Twickenham. He collaborated with Rameau on several musical pieces, corresponded with Haller and Spallanzani, and antagonised J.-B. Rousseau.