This book is not only a complete aid for high school students, but also a useful guide for educators on teaching Thucydides' History in high school. The approach to the text is functional and innovative, contributing to a deeper interpretation of it. Excerpts from Thucydides' 3rd book, which are included in the textbook, are structured in this book into teaching units, facilitating the student's understanding of the knowledge and helping the teacher to respond to new educational data.