Raider of the lost island...

A few days ago, I noticed this old map of Paris in a shop window. It says "Nouveau plan de la ville de Paris, capitale du royaume de France" (new map of Paris, France's kingdom capital) but it's probably 600 years old, as it mentions l'Isle Louvier (after the name of its owner, Mr Louvier!), an island that was then next to île Saint Louis . Don't look for it if you come to Paris, this island does not exist anymore, as it has been "attached" to the right bank in 1847. I had never heard of this story until today. Thank you PDP ;)