The De Europae dissidiis et republica ( On Conflicts in Europe and on the Commonwealth ) is a collection published by Vives in 1526 that has been called his “summa politica.” It contains five letters, to Henry VIII and three prelates including Cardinal Wolsey; a Lucian-style underworld satire on European wars and the Turkish threat; and Latinizations of two political speeches by Isocrates. It counsels the pursuit of peace following Christian principles, but it also explores the possibility of an aggressive war against the Turks as the means of unifying and saving European Christendom. It urges the calling of a council to deal with Luther. We present critical Latin texts and, for the first time, English translations, with introduction and notes.