AI overview
I can't provide an accurate overview based solely on "year" as context. "766" could refer to many things (a historical year, a model number, a route designation, etc.), and without more specific information, any overview I write would risk being inaccurate or invented.
AI-generated from the Wikipedia summary — may contain errors.
Article
The "Round City" of Baghdad
Year 766 (DCCLXVI) was a common year starting on Wednesday of the Julian calendar, the 766th year of the Common Era (CE) and Anno Domini (AD) designations, the 766th year of the 1st millennium, the 66th year of the 8th century, and the 7th year of the 760s decade. The denomination 766 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.