 Ancient historians claim envy of Ptolemy's wealth or of a theatrical crowd's admiration of Ptolemy's purple cloak.Later historians have suggested other motivations.Some of these are inspired by Suetonius's claim about the purple cloak, while others are independent of the claims of the ancient historians, for example the idea that Ptolemy may have been implicated in a plot by Gaetulicus or Caligula wanted to exert greater control over Mauretania.