High Quality Content by WIKIPEDIA articles! The Portland Vase is a Roman cameo glass vase, currently dated to between AD 5 and AD 25, which served as an inspiration to many glass and porcelain makers from about the beginning of the 18th century onwards. Since 1810 the vase has been kept almost continuously in the British Museum in London. It was bought by the museum in 1945 (reference - GR 1945,0927.1) ; on display in Room 70, Rome: City & Empire).