<prompt> Translate the following text to SwahiliSet in the floor by the central door is the large round slab of red porphyry where King Charlemagne knelt for his coronation as emperor in the year 800 .  <response>: Katika sehemu ya chini ya mlango wa kati kuna bamba kubwa la porphyry nyekundu ambapo Mfalme Charlemagne alipiga magoti kwa ajili ya kutawazwa kwake kama maliki mwaka 800. 