Which piece of sculpted roman glass was named after one of its owners, margaret bentinck, an english duchess?

The piece of sculpted roman glass that was named after one of its owners, Margaret Bentinck, an english Duchess, is Portland Vase. It is a 1-25 CE glass and it was made by the dip-overlay method, the cutting was probably performed by a skilled gem-cutter, there is an amazing degree of detail as we can see from the four-figures and a tree-like plant.