For some people philosophy is everything. For others it's nothing. It's a subject that solves problems, causes arguments and even brings war. But what is philosophy, and who are the famous men and women who have changed our world with their ideas?

In this eBook, you will find simple biographies and basic explanations of the ideas of twenty of the most important western philosophers. It can be read in chronological order, or as a quick reference for each major thinker.