Unlike most contemporary figurations of Dionysus as a lithe youth, the self-consciously archaising god is heavily draped, with an ivy wreath and a long archaic-style beard; probably he bore a thyrsos in a raised right hand, now missing.
[1] The misidentification with Sardanapalus was erroneously confirmed in the example in the Vatican Museums, which was provided in antiquity with an inscription that reads ϹΑΡΔΑΝΑΠΑΛΛΟϹ (Sardanápallos), giving the type its erroneous name (it has no true association with this legendary king).
In the early 19th century, Ennio Quirino Visconti cogently argued, against Johann Joachim Winckelmann and other earlier antiquarians, that the "Sardanapalus" of the Museo Pio-Clementino was in fact a Dionysus.
The Romans elaborated the Sardanapalus type further, often showing the god with subsidiary figures.
In Oliver Stone's biopic Alexander (2004), Dionysus is shown on-screen as bearded, longhaired, crowned with ivy, and draped in a lion skin and voluminous chiton, in a variation on this "Sardanapalus" statue type.