The Devil's Blacksmith: The Legendary Gates of Notre-Dame - Medievalists.net
Briefly

The intricate ironwork on Notre-Dame's doors, attributed to Biscornet, was so complex that it led to the legend of a pact with the devil for completion.
Biscornet's work involved extensive heating and hammering, deviating from the common casting techniques of the era and raising doubts about human capabilities.
As the cathedral neared completion, Biscornet, pressured by time, allegedly made a deal with the devil to finish the magnificent ironwork.
The dramatic unveiling of the doors was marred when they initially refused to open, only swinging wide after being blessed with holy water.
Read at Medievalists.net
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