AI overview
I don't have enough context to write an accurate overview. "309" could refer to many things (a year, a route number, a legislative code, etc.), and you've only provided "year" as context, which doesn't clarify which specific meaning you're asking about. Could you provide more information about what "309" refers to?
AI-generated from the Wikipedia summary — may contain errors.
Article
Diocesis of Hispania
Year 309 (CCCIX) was a common year starting on Saturday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Licinianus and Constantius (or, less frequently, year 1062 Ab urbe condita). The denomination 309 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.