The article systematically presents and substantiates the stylistic concept of some unique artistic tendencies of Hellenism, which share a common sacred nature with the pictorial canon of eastern churches. It also proposes updated retrospective artistic principles to reassess the role of these tendencies. This finding allows us to reveal additional roots of the pictorial canon and review the cause-and-effect relationship between the narrative-symbolic-decorative attributes of ancient funeral rituals and the spiritual-philosophical foundations of early Christian art. It suggests filling the gaps in art history and cultural studies within the framework of relevant themes by introducing modeled and unified conceptual-categorical constructions into scientific circulation. The purpose of the research. The main purpose of the article is to rethink and systematize some artistic and stylistic tendencies of the Hellenistic’s era in late antiquity, from which all Eastern church pictorial traditions drew their conceptual and stylistic foundations during their formation period. The methodology. A combination of specialized methods was applied: historical-comparative method for identifying key artistic tendencies; cultural-deductive method for formulating artistic categories; abstraction method for delineating key stylistic features of sacred attributes, as well as for identifying differences and similarities; expert artistic assessment method for theoretical characterization, substantiation, and expansion of conceptual-categorical components; stylistic correlation method for unifying newly discovered stylistic connections of Hellenistic artistic products and the Christian tradition. The combination of the listed methods allows us to reveal the concept of the stylistic basis for the pictorial tradition in the church paraphernalia of the Eastern rite and to systematize the existing authoritative evidence base regarding to origins of the pictorial canon of the Egyptian and Greco-Roman periods. Conclusions. Our analysis shows that in the broad context of the formation of the pictorial canon, peculiar to the churches of the Eastern rite, some artistic trends of the first centuries of the new era turned out to be an unchanging and stable conceptual basis for the pictorial canon in a complex artistic and philosophical coordinate system. Thus, the artistic canon of the Eastern churches, formed between the VI and IX centuries, is nothing more than a borrowed status-functional category for the multi-level gradation of Christian value aspects with specific techniques and means of Hellenistic fine art of the times of ancient Egyptian and Greco-Roman syncretism. Their intermedial nature and appellative character in relation to the Theogony of the ancient world limit the traditional interpretation of the Christian symbolism of the vast majority of canonical images in the artistic plane. The scientific novelty. For the first time our research analyzed the cause-and-effect relationship between canonical Christian stylistic attributes and Greco-Roman and Egyptian features as the ideological basis of the latter for the formative role of the former. It reassessed and re-evaluated some Hellenistic artistic tendencies in terms of their significance and complexity. A number of expanded cultural and art historical concepts and categories of the ancient world are proposed and substantiated.