Kosk Madrasah and Dome located in Kayseri is among the important works of Turkish Architecture History. This structure, which belongs to the Eretna Principality, which has a unique plan, was the subject of extensive research. In fact, it is known that this building was first built as a hanikah by Emir Alaeddin Eretna, and that it served as a madrasah. In addition to its closed spaces, there is also the Dome built by Emir Eretna's wife Suli Pasha in the courtyard of this building. The subject of our article is the reliefs on the embrasures of this Dome. In this article, it is pointed out that these reliefs, which some researchers describe as stamps of stonemasons, are actually similar to three-slice crowns, and their iconography is emphasized. In the old Turkish beliefs, the meanings of the three-slice crown, which started with the protector of women and children Umay, kneaded with Islamic belief and mysticism, and the traces of the three-slice crown shape symbolizing these meanings are emphasized. The "three-slice crown" that we encounter in various materials, techniques and styles in different periods of Turkish Art is evaluated in the example of the Suli Pasha Dome.