Variable Celebrant Prayers in the Medieval Coptic Eucharist: A Bohairic Manuscripts-Based Inventory and Introduction

The medieval Bohairic Eucharist emerges as a constellation of overlapping local practices shaped by scribal discretion and evolving liturgical memory. That plurality comes into focus through the manuscript tradition itself. Surveying approximately 375 euchologia codices from the 13th to 20th centuries, this article identifies twenty-four alternate celebrant prayers across nine liturgical units from the raising of incense to communion, fourteen of which are entirely absent from the received printed edition of 1902. Beyond offering the first systematic inventory of variable celebrant prayers, the study shows that many prayers preserved in manuscripts never entered the received euchologion, while others privileged in print remained historically marginal. Together, these findings attest to enduring regional diversity despite repeated efforts toward standardization. The analysis further uncovers relationships between three previously unexamined manuscripts that preserve distinctive repertoires of alternate prayers, suggesting regional and exemplar-based liturgical families. By recovering this diverse liturgical landscape, the study positions variableprayers as a central feature of the Bohairic eucharistic tradition and a lens for understanding its historical development among the Copts and in relation to other Eastern liturgies.