<prompt> Translate the following text to SwahiliSteps nearby lead underground to the Lapis Niger, a black marble pavement laid by Julius Caesar over the presumed grave of Romulus, the citys founder.  <response>: Huko chini ya ardhi kuna mlango unaoitwa Lapis Niger, ambao ni mlango wa marumaru uliotengenezwa na Kaisari Yulio na ambao unadhaniwa kuwa kaburi la Romulus, mwanzilishi wa jiji hilo. 