The allelengyon () was a tax established in 1002 by the Byzantine Emperor Basil II, requiring the wealthiest landowners to pay the tax debts owed by their poorer neighbours. It relied on a concept long extant in Hellenistic and Byzantine law, but was abolished by Romanos III Argyros in 1028.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).