around 470 BC until 450 BC. Except for the Panathenaic prize amphoras, the black-figure style came to a close in Attica at this time. Panathenaic prize amphoras Among black-figure Attic vases, the Panathenaic prize amphoras play a special role. After 566 BC—when the Panathenaic celebrations were introduced or reorganized—they were the prize for the winners of sport competitions and were filled with olive oil, one of the city's main export goods. On the front they routinely bore the image of the goddess Athena standing between two pillars on which roosters perched; on the back there was a sports scene. The shape was always the same and was only modified slightly over the long period of its production. The belly amphora was, as its name suggests, originally especially bulbous, with a short neck and a long, narrow foot. Around 530 BC the necks become shorter and the body somewhat narrower. Around 400 BC the vase shoulders were considerably reduced in width and the curve of the vase body looked constricted. After 366 BC the vases were again more elegant and become even narrower. These vases were primarily produced in the leading workshops of the Kerameikos district. It seems to have been an honor or particularly lucrative to be awarded a commission for producing the vases. This also explains the existence of many prize amphoras by excellent vase painters. In addition to superior black-figure painters like the Euphiletos Painter, Exekias, Hypereides and the Leagros Group, many red-figure master craftsmen are known as creators of prize amphoras. These include the Eucharides Painter, the Kleophrades Painter, the Berlin Painter, the Achilleus Painter and Sophilos, who was the only one to have signed one of the surviving vases. The first known vase was produced by the Burgon Group and is known as the Burgon vase. Since the name of the ruling official (Archon) occasionally appears on the vase after the 4th century BC, some of the vases can be precisely dated. Since the Panathenaia were religious festivals, the style and the type of decoration changed neither during the red-figure period nor after figured vases were no longer really traded in Athens. The prize amphoras were produced into the 2nd century BC, and about 1,000 of them have survived. Since for some dates the number of amphorae awarded to a winner is known, it is possible to deduce that about one percent of the total production