AthDGC: An Open, Versioned Parallel Treebank for Diachronic Greek

Abstract The AthDGC (Athens Digital Glossa Chronos) is the first parallel diachronic treebank of Greek, outside of Biblical texts. Developed by the CVL-CDSAML Project (A Corpus-based Valency Lexicon for a Contrastive and Diachronic Study of Ancient and Medieval Languages), it includes over 100 important digital texts (fourth to eighteenth centuries AD) and their translations and retranslations, and aims to produce approximately 2.8 million tokens through a combined automated-and-manual workflow. Future growth plans include reaching 500 texts (approximately 10 million tokens) and extracting a diachronic valency lexicon. Annotation follows the PROIEL scheme, applied semi-automatically, with linguist-validated samples, and is extended to include custom features for innovations in Byzantine Greek. The treebank and lexicon will both be released into the public domain (CC0) and have explicit versioning and error profiling to provide reproducible diachronic research.