Execution Without Hearing Under the Moorish Kings in Granada (1870) by the French painter Henri Regnault (1843-1871).
One art historian wrote about this painting, that "the painter had played with the blood of the victim as if he were a jeweller toying with rubies." I think, that hits the nail on the head. Regnault was primarily interested in orientalistic and exotic subjects. He was inspired to this painting by old legends during his stay in Spain.