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I don't have enough context to provide an accurate overview of "717." The context provided only indicates it's a year, but without knowing which historical event, discovery, or topic you're asking about, I cannot write a factually grounded explanation. Could you provide more details about what aspect of 717 you're interested in learning about?
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Article
The Byzantine Empire (717) with its themes Leo III (left) and his son Constantine V
Year 717 (DCCXVII) was a common year starting on Friday of the Julian calendar. The denomination 717 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.