<prompt> Translate the following text to EnglishIna marumaru maridadi na, kuchongwa katika ukuta wa moja ya vyumba vidogo, mstari wa msalaba wenye utata unaochukuliwa na baadhi kama moja ya mabaki ya kale ya Kikristo, ingawa wengine wanasisitiza kwamba nembo hiyo haikukubaliwa hadi kugeuzwa kwa Konstantino karne tatu baadaye.  <response>: It has splendid marble paving and, etched in the wall of one of the smaller rooms, a controversial croseregarded by some as one of the oldest Christian relics, though others insist the emblem was not adopted until the conversion of Constantine three centuries later. 