Paragraph on "oldest marble bust" moved and deleted 
Paul Zanker, a world-renowned archaeologist and expert on Caesar & Augustus has shown that the marble bust from Arles is not Caesar. Therefore it is of no relevance to this article. I reworded the paragraph (pros & cons plus sources), and moved it to Arles#Archaeology. If some day in the distant future, the communis opinio will see this as a portrait of Caesar, we can always reintegrate it. —