John Toland was one of the most remarkable of Swift’s Irish contemporaries. He was a man of many parts and extraordinary versatility: a linguist with some claims to scholarship, a political propagandist and a speculative-thinker. At the same time, he was brash and indiscreet, with the result that he fell out with one patron after another and was forced to make a precarious living as a Grub Street hack. But his writings influenced later generations, were translated into French and German, and gave him an international reputation as one of the forerunners of the age of reason.