I don't have sufficient context provided to write an accurate overview of "421 BC." To give you a factual, neutral summary, I would need specific information about what happened in that year or why it's historically significant. Could you provide additional context about what "421 BC" refers to?
AI-generated from the Wikipedia summary — may contain errors.
Year 421 BC was a year of the pre-Julian Roman calendar. At the time, it was known in Rome as the Year of the Consulship of Vibulanus and Barbatus (or, less frequently, year 333 Ab urbe condita). The denomination 421 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Events
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).