If there's any one core lesson from history, it's that NO ONE'S culture is sacred.  We've all been invaded at one point or another in our cultural history, and we've all seen stuff go by the wayside due to those invasions, but we've also see things survive invasions and prosper.  It's a modern cultural arrogance that we expect invasions from 200-300 years ago to have literally no repercussions and to leave entire historical cultures whole.