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Why were Venetian glass furnaces moved to Murano in 1291?

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fish of core-made glass — glassware Fish of core-made glass with “combed” decoration, Egyptian, New Kingdom, 18th dynasty (c. 1363–46 bc). In the British Museum. 0.141 m × .069 m.

In 1291, the glass furnaces in Venice were relocated to the neighboring island of Murano primarily to mitigate the risk of fire within the city.12

This move was a significant turning point for the industry, as Murano subsequently became the central hub for Venetian glass production, a position it has maintained for centuries.13