The prevalence of hero/deity conflict with serpents in Indo-European culture:
https://en.wikipedia.org/wiki/Chaos_(cosmogony)#Chaoskampf>How to Kill a Dragon: Aspects of Indo-European Poeticshttps://smerdaleos.files.wordpress.com/2014/10/151964305-how-to-kill-a-dragon-by-calvin-watkins.pdf>The Saint George and the Dragon legend describes the saint taming and slaying a dragon that demanded human sacrifices; the saint thereby rescues the princess chosen as the next offeringhttps://en.wikipedia.org/wiki/Saint_George_and_the_DragonAs the pastebins show, you can also find snake imagery in other parts of the world totally unconnected to Indo-Europeanism, often combined with human sacrifice practices