This paper re-evaluates a small but significant group of Armenian canon law texts in light of the analytical framework developed by the NOMOS project, which examines the adaptation of Eastern Christian legal regimes to the rise of Islam. It focuses on three synods convened between the Council of Duin (644) and the Council of Partaw (768), a period encompassing the earliest phases of interaction between Christian Armenia and the Islamic world, marked by moments of political instability and crisis. The Council of Duin of 644 introduced specific canonical measures addressing the social and legal disruptions caused by the first Arab incursions into Armenia, particularly in the areas of marriage, inheritance, and church property. More than a century later, the Council of Partaw of 768 was convened against the backdrop of mounting tensions between the Armenian nobility and the newly established Abbasid dynasty. Several of its canons reflect this unstable situation, which would culminate in a major rebellion of the Armenian princes only seven years later. Between these two councils, the Council of Duin of 719—best known for its doctrinal and liturgical regulations under the leadership of Catholicos Yovhannes Awjnecʿi—also contains significant indications of the new Islamic reality, suggesting that even non-crisis synods responded to changing political and religious conditions. By placing these councils in closer dialogue with one another, this contribution focuses in particular on canons concerning "foreigners," a term commonly used in Armenian canonical sources to refer to Muslims. It argues that these synods, whether convened in moments of acute crisis or under longer-term pressure, played a formative role in shaping the Armenian canonical response to Islam.