This preprint presents an interdisciplinary reassessment of the missing quire of the Codex Gigas (MS A 148), one of the largest and most structurally significant medieval manuscripts, currently preserved at the National Library of Sweden. The manuscript contains a deliberate lacuna corresponding to the removal of an entire quire, traditionally interpreted as having contained the Rule of Saint Benedict. While this interpretation remains structurally plausible, it is not supported by direct evidence. This study introduces the Hybrid Application Hypothesis, which proposes that the missing quire contained a composite instructional framework integrating penitential, ritual, and disciplinary materials. Rather than presenting novel or heterodox content, the hypothesized text would have synthesized widely accepted monastic practices into a structured system addressing complex or atypical scenarios, including cases where standard procedures proved insufficient. These applications, while grounded in orthodox tradition, may have been considered overly prescriptive, contextually sensitive, or institutionally unsuitable for long-term preservation. The research integrates codicological analysis, archival reconstruction, and epistemological evaluation, supported by a chronologically reconstructed transmission history of the Codex Gigas from Podlažice through Sedlec and Břevnov to Broumov. The study identifies the period between approximately 1425 and 1500—spanning the later years of its association with Břevnov and its early consolidation at Broumov—as the most plausible window for the removal of the missing quire. This timeframe corresponds to the broader disruption and reorganization of monastic institutions during and after the Hussite Wars. To evaluate competing interpretations, the study applies two methodological frameworks: Anomalous Systems Analysis (ASA) and the Unified Archetypal Bayesian Theory (UABT). These approaches provide a structured means of assessing hypotheses under conditions of incomplete evidence, emphasizing explanatory coherence across structural, contextual, and historical domains. Within this framework, the Hybrid Application Hypothesis emerges as a viable and internally consistent alternative to the traditional Rule-based interpretation. This work is presented as a preprint and represents a first-phase analytical framework. It does not assert definitive conclusions but establishes a constrained and evidence-based model for further investigation. Future research will focus on material analysis of the manuscript, expanded archival exploration of Bohemian codicological artifacts, and comparative study of related monastic texts. Peer review from specialists in codicology, manuscript studies, and medieval archival research is welcomed. Opportunities for funded collaboration are actively sought to support continued investigation and empirical validation.
Zachariah Laing (2026) studied this question.