"This introductory chapter provides an overview of the study of the history of philosophy. In general, there is an enormous difference between those who concern themselves with ancient philosophy, those who concern themselves with medieval philosophy, and the students of the history of modern philosophy. And, across this distinction, there are a great variety of approaches. One should not forget that the historiography of philosophy itself in many ways is a product of history and reflects the historical context in which it is pursued. Nevertheless, what this book is interested in is not the factual question why historians of philosophy do what they do, but the theoretical question, the question how one ought to conceive of and explain what they are doing; though they themselves in this work may not in fact be guided by these assumptions and principles, there must be such principles to the extent that their activity is a rational activity. It is also important to note that philosophers tend to criticize historians of philosophy as being unduly historical and not sufficiently philosophical"--