Byzantine sigillography is intrinsically interdisciplinary. Unlike other sister auxiliary disciplines, such as epigraphy or numismatics, sigillography has not yet benefited from the experience gained within the Digital Humanities. SigiDoc, the newborn encoding standard for Byzantine seals, is the first attempt to bridge this gap. This paper is aimed at investigating the interactive fusion of aspects of interdisciplinarity between Byzantine Sigillography and the Digital Humanities whilst illustrating the 'digital genealogy' of SigiDoc in the broader context of TEI, as well as its relationship of reciprocity with open source initiatives and tools, such as EpiDoc and EFES (EpiDoc Front-End Services).