What happened
Using advanced casting techniques, the Dong Son culture produced great bronze kettledrums. The finest, like the Ngoc Lu drum, carry tympana decorated with a central sun-star ringed by bands of plumed dancers, birds, deer and boats.
Background
Dong Son was the Bronze Age civilization of the Red River delta, flourishing roughly through the first millennium BC into the early centuries AD. The culture was defined by excavations begun in 1924 at the village of Dong Son in Thanh Hoa.
Consequences
The drums traveled far: examples are found from southern China across mainland Southeast Asia to the Indonesian archipelago, evidence of wide exchange networks. They stand as the emblem of a sophisticated civilization in Vietnam before Chinese rule, and the drum-face motif is ubiquitous in modern Vietnamese national imagery.