"Cage cup", or a diatretum – a luxury late Roman glass vessel, found from roughly the 4th century. Today, some 60 fragmentary diatreta are known today, 19 of which are almost complete. This piece, was found in 1950 in the sarcophagus in Niederemmel, near Trier, Germany.
Diatreta consist of an inner beaker and an outer cage that stands out from the body of the cup, to which it is attached by short stems. This exemplar is part of the Trier Landesmuseum permanent collection.
The manufacturing technique must have been laborious, but it's still a mystery: either the inner beaker and the cage were made separately and heat-soldered, or the whole assembly was chiselled from a single block of glass.
The majority of finds of diatreta are from Roman sites along the Rhine, suggesting that they were produced in the area, perhaps at Trier. This was the largest city of Roman Germany and the main residence of Constantine I for many years, coinciding with the period when the cups seem to have been made.
Photos and text by Time Travel Rome
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