Sphragis (σφραγίς, "sigil") is a benchmark for Ancient Greek (grc) prose and verse authorship attribution (AA). Its input is the complete curated union of the human-annotated CoNLL-U trees in the supported treebank projects, including lemma, part of speech, morphology, and dependency relations. It defines 1-, 10-, 50-, and 100-sentence attribution tasks. The complementary scanned-line benchmark is published separately as Urdatorn/sphragis-metre.

For the archaic Greek… See the full description on the dataset page: https://huggingface.co/datasets/Urdatorn/sphragis.