We know that glass was being made in Venice in 982 AD and so we can assume that it was being made there earlier, perhaps much earlier. Certainly old Venetian glass is very similar to that which was made in the ancient world, in Rome and even in Greece, and so is probably part of that tradition.
In 1291, worried about fires from the furnaces, the Venetian government ordered all glassmakers to move to the island of Murano, which has been a byword for glass ever since. Gianpaolo Seguso, head of one of the most famous families of glassmakers, can trace his family business back to 1397, only a hundred years later.
In about 1450, with the invention of crystal, clear glass, Murano became one of the most important and prestigious glass-making centres in Europe. A position it holds to this day.