The name of Pufendorf is often associated with the phrase that appeared in his 1667 tract about the Holy Roman Empire: it was, he observed, ‘monstro simile’ (like a monster). To many generations of scholars from the mid-nineteenth century onwards, the phrase seemed appropriate since they viewed the Holy Roman Empire as an anachronism that was doomed for centuries before it expired in 1806. Yet Pufendorf himself denied that he wished to condemn the empire but rather claimed he wanted to improve it and to create a better understanding of it; indeed, he removed the phrase from the second edition of his text. This chapter examines Pufendorf’s writing about the empire in the context of the political situation of his time and considers his work as a constructive and positive contribution to a wide-ranging debate. This explains why his 1667 tract was regarded so highly in the eighteenth century as one of the best short guides to the nature and politics of the empire, which scholars have only recently begun to appreciate once more.