Abstract: Some believe that Byzantine art replaced Roman art, and they do not pay attention to the impact of the East, starting with Egypt, Syria and Persia, in the revival of Byzantine art and even Byzantine thought. These works on the impact of the Arabs and the Armenians during those 1 centuries, and by the fourth century AD, icon art began to flourish and develop, and King Constantine and his mother, Empress Helena, had icons representing them, and Christianity became the state religion, and churches were built and decorated everywhere, and the iconographic concept changed, which became clear in terms of themes and method of drawing. The research focuses on the definition of the icon, the way it was made, the circumstances that led to its creation, and the war that was fought to prevent it. The descriptive analytical method was followed in preparing this study. The research dealt with a descriptive study of some of the icons displayed in St. Catherine's Monastery in Sinai, explaining the different manufacturing methods and the temporal variation in their production.