1556 Tarihli Muhammediye’de Yardımcı Ünlüler Açısından Dudak Uyumu

In this study, the issue of labial harmony in terms of auxiliary vowels in the 1556 dated copy of Yazıcıoglu Mehmet's Muhammediye, which is one of the works of transition period from Old Oghuz Turkish to Ottoman Turkish, has been addressed. The work presents important language data in terms of revealing the historical course of Oghuz Turkish.The 16th century is a transition period between the Old Oghuz Turkish period when there was no labial harmony and the post 18th century when this process was completed. The copy of the Muhammadiye we have dealt with presents important phonological language data as it was in this transition phase. In the text, we encountered numerous examples regarding the transition to labial harmony has begun primarily with the auxiliary vowel close to the base of the word.In our text, it seen that some auxiliary vowels take turns and some auxiliary vowels do not. It was determined that auxiliary vowels were brought to different words bases in a different way in term of flatness and roundness, as well as to the same word base in a different way.The data about the auxiliary vowels we have presented in the study are the witnesses that the dialects of the dominant Oghuz tribes, which are rarely seen in terms of labial harmony in Old Oghuz Turkish texts, started to enter the texts in the 16th century.