had taken place. constantine, the firstsent roman emperor to become a christian, sent helena to the holy land.e ch the c nativity evolved over time. this is the original door way here that was subsequently blocked and wer slowly the doors were filled in perhaps as a defensive measure to protect against soldiers on horseback and ultimately a very small door that youown have to bend down to enter in reverently. burned and destroyed in the sixth century, evidence of the original church remain.i what are we seeing here,oo this mosaic?he we re looking at the floor of the fourth century constantinian church. it s done in a typical byzantine style of geometrics and floral.he