Moorish gas lamps in Europe

What if that Moorish innovation is used in many Western European cities pre Renaissance ? Or in Byzantine´s capital Constantinople ?
 
What if that Moorish innovation is used in many Western European cities pre Renaissance ? Or in Byzantine´s capital Constantinople ?

Err... What?

A quick google doesn't enlighten me any. What are you talking about? What 'gas'? Etc.

I'm not doubting it's a thing, but I have no clue what it is, which would be a requirement for speculating. I suspect strongly that most other readers are in the same boat.
 
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