Is there an Emperor Yan in history? Or is there no such person at all?

Emperor Yan is a legend, but there are many records about him in ancient historical books. This figure definitely exists, and it should be said that before the Yellow Emperor seized the imperial power from Yandi, the sovereignty of China was in the hands of Yandi tribe. Yan Di, defeated by the Yellow Emperor, was the last emperor of the Yan Di tribe, and there may have been several emperors before him.