sentences:  New cemeteries had to be built across the entire Russian empire, and from then on they all had to be located "outside" city limits.One of the main motivations behind these measures was overcrowding in church crypts and graveyards.However the true deciding factor which led to the new laws being enforced on such a mass scale across the entire Russian empire was to avoid further outbreaks of highly contagious diseases, especially the black plague which had led to the Plague Riot in Moscow in 1771.