The Ethiopian Orthodox Tewahedo tradition locates its origins in the late antique kingdom of Aksum (Axum), a polity that flourished in the northern Horn of Africa from roughly the first to the seventh centuries CE. Aksumese political power and international trade connected the region to the Roman Mediterranean, the Arabian Peninsula, and the Red Sea world; archaeological sites around the modern city of Axum preserve monumental stelae and coinage that attest to this network. Historians generally treat Aksum as the political context in which Christianity acquired an early and authoritative foothold; the most widely cited date for the adoption of Christianity by the Aksumite state is the mid-fourth century. Tradition and scholarly reconstruction diverge on particulars, but together they form the foundation story of the church.
A central figure in the tradition's own account is the missionary commonly called Frumentius and known in Ethiopian tradition as Abba Salama. According to the narrative preserved in Ethiopian hagiography and later sources, Frumentius was a Christian youth of Syrian or Phoenician descent who, after being shipwrecked or detained in Aksum, gained access to the royal court and helped to Christianize members of the royal household. The royal conversion is often associated with King (or Kinglet) Ezana of Aksum; inscriptions attributed to Ezana and archaeological evidence such as coinage bearing crosses are used by historians as independent evidence that an Aksumite ruler embraced Christianity in the fourth century. Asserting a formal ecclesial founding, the tradition holds that Frumentius traveled to Alexandria and obtained episcopal consecration; he returned to organize the nascent church in a pattern long linked to the Coptic Church of Alexandria.
Scholars date the transformation of Aksum into a Christian polity to the fourth century CE and point to material culture—inscribed stelae, Greek-language inscriptions, and coinage bearing Christian symbols—as corroborating evidence. Where the tradition names particular protagonists and frames conversion as a providential event, modern historians emphasize the social, economic, and diplomatic pressures that made Christianity an attractive identity for an expanding state linked to Christian Byzantium. This contrast—the devotional narrative of a single missionary founding a church versus the historian's account of gradual religious change within a state apparatus—illustrates a persistent tension in reconstructing origins.
From these fourth-century beginnings, the Christian community in Aksum developed distinctive institutions. The Ge'ez language, at that time a spoken Semitic tongue of the highlands, became the vehicle for liturgical language and written theology; the earliest surviving Ge'ez inscriptions and manuscripts point to a literate religious culture that integrated scripture, hymnody, and legal pronouncements. By the late antique period monasteries and episcopal centers had emerged in the highlands; tradition credits the growth of monasticism to figures who combined ascetic practice with pastoral governance, establishing monasteries that would remain focal centers of social life for centuries.
A further horizon in the foundation story is the way the Ethiopian tradition anchors its royal and religious identity to the narratives of Israel. The Kebra Nagast, a medieval work widely read within the tradition, narrates the visit of the Queen of Sheba (Makeda) to King Solomon and tells how the Ark of the Covenant was brought to Ethiopia. The Kebra Nagast is a fourteenth-century composition in Ge'ez by scholarly consensus, yet adherents treat its story as definitive for national and ecclesial identity: it frames the Ethiopian monarchy and priesthood as heirs to a Solomonic covenant. Scholars classify the Kebra Nagast as a later national epic that appropriated older oral and scriptural motifs; the nineteenth- and twentieth-century rediscovery and translation of the text by European scholars increased its global visibility.
The label by which the church is known in its own languages expresses a theological claim that also traces to these formative centuries. The term "Tewahedo"—from Ge'ez and Amharic—literally means "being made one" and is used by adherents to articulate a Christological idiom emphasizing the unity of Christ's nature(s). Historically this phrasing situates the Ethiopian communion within the family of Oriental Orthodox churches that emerged in theological distinction from Chalcedonian (Eastern Orthodox and Western) formulations after the Council of Chalcedon in 451 CE. The Ethiopian church's Christological self-definition, and the ways in which it was shaped by Alexandrian theology, will be treated in greater detail below; already at the founding stage the Aksumite church was linked institutionally and theologically to Alexandria—and through Alexandria to broader debates in late antique Christianity.
By the medieval period, the church had become a national institution, intertwined with royal ideology, land endowments, and a growing corpus of hagiography in Ge'ez. Churches, monasteries, and liturgical centers accumulated manuscripts—biblical codices, liturgical formularies, and saints' lives—thus institutionalizing a textual and ritual life that would endure despite later political ruptures. Sites such as Lalibela (traditionally dated to the late twelfth/early thirteenth century and associated with King Lalibela) provide a material witness to medieval religious creativity: rock-hewn churches here became focal points of pilgrimage and ritual.
In sum, the founding of the Ethiopian Orthodox Tewahedo Church is best understood as a historically situated, multi-causal process. Devotional accounts center missionary figures, royal conversion, and a Solomonic linkage; historical-critical scholarship reads these developments against the background of Aksumite state formation, Red Sea trade connections, the influence of Alexandrian Christianity, and the internal dynamics of religious change. Both lenses are essential: the tradition's founding story continues to shape liturgical memory, ecclesial self-understanding, and claims about sacred objects (notably the Ark), while archaeological, epigraphic, and comparative textual evidence helps to contextualize how Christianity became the enduring religion of much of the Ethiopian highlands.