Ca. 200-300 AD A yellowish-light green glass beaker with a flaring rim, lightly piriform body, and ring foot; slight encrustation and iridescence. Glass was a major manufacturing industry in the Roman Empire, especially after the invention of glassblowing in the middle of the first century BC, when glass became used for a variety of purposes including vessels, jewellery and construction materials such as glass or tiles.For a very similar glass beaker, see:https://www.christies.com/en/lot/lot-3912039.To read further about Roman glass, see:Bayley, J., Freestone, I., & Jackson, C. (2015). Glass of the Roman World. Oxford And Philadelphia: Oxbow Books. Size: L:100mm / W:75mm; 50g Provenance: From the private collection of a Central London gentleman; previously in a collection formed on the UK/European art market before 2000.