From The Telegraph:
Some experts highlighted an entry in the Anglo-Saxon Chronicle which refers to a “red crucifix” seen in the night sky, but this occurred in 776 – a year too late – and does not explain why no remnants of the event have since been detected by astronomers. 
From Roger of Wendover regarding 794 AD:
“In the year of our Lord 794, Humbert, archbishop of…    
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