Which reminds me of The Cagots were a persecuted minority who lived in the west of France and northern Spain [0]

  The origins of the Cagots remain uncertain . . . . Despite the varied and 
  often mythical explanations for their origins, the only consistent aspect of 
  the Cagots was their societal exclusion and the lack of any distinct physical 
  or cultural traits differentiating them from the general population.