how to understand the painting of the xix century (6) "morning of the streltsy execution" by vasily surikov

understand painting xix painting xix century painting xix streltsy execution vasily execution vasily surikov understand painting execution vasily painting vasily surikov xix century morning xix century morning streltsy execution vasily xix streltsy execution century morning streltsy execution surikov century morning morning streltsy streltsy century understand morning