In this lecture, James Moore discusses three denominations of Protestant theology: Calvinism, or the dogmatic theology of the Reformed or Presbyterian churches; the theology of the Arminians or the Remonstrants in the Netherlands, the most important of whom for the purposes of this lecture is Hugo Grotius; and the theology of the Socinians, the most significant of whom was John Locke. It is a story that travels from Geneva to Holland, to England, and back to Geneva for some closing remarks on Jean-Jacques Rousseau, whose political principles are taken to be a return to the principles of Calvin and his followers.