Hendiadyoins frequently used in Turkish throughout the history have appeared in almost every era and every written publication. These structures are formed by repeating words that have the same, close, or the opposite meaning. Hendiadyoins which add power and fluency to the narration are also an element of harmony. In the Vatican Copy of the book of Dede Korkut, we can come across to the hendiadyoins in both sentence level and word level. That is why the language of the book is very powerful and fluent.
We have tried to detect the hendiadyoins in Dede Korkut after we have given brief information about them. Firstly, we have shown the place and importance of them in a language. Then, we have talked about introductions, classifications and explanations that researchers made. We have tried to put forward the controversial points that have come out after our investigations. Lastly, we have handled and evaluated the hendiadyoins in the Vatican Copy of this book according to certain rules, and under some subtitles.
Key words: Turkish language, hendiadyoins, book of Dede Korkut.