Where is Guiscard from?

Meaning of the name Guiscard

Norman French form of the Norman name Wischard , from Old Norse vizkr "wise" and the Old French pejorative suffix -ard (from Frankish hard "brave, hardy"). This was the byname of Robert Guiscard, an 11th-century Norman conqueror of Sicily.

Characteristics of the name Guiscard

How do we know this about Guiscard

(and is it secret spies?)

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