Old S. Peter's Basilica, Rome Drawing ca. 1450 Source: http://en.wikipedia.org/wiki/Old_St._Peter's_Basilica#mediaviewer/File:Basilica_di_San_Pietro_1450.jpg

Old S. Peter's Basilica, Rome Façade Source http://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Basilica_(building)#mediaviewer/File:Basilica_9.png

Old S. Peter's Basilica, Rome Section Source: http://upload.wikimedia.org/wikipedia/commons/8/85/De_sacris_aedificiis_a_Costantino_Magno_constructis_synopsis_historica_pag._33_Tab._VIII.jpg

Old S. Peter's Basilica, Rome Section Source: http://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Basilica_(building)#mediaviewer/File:Basilica_11.png

Old S. Peter's Basilica, Rome Section Source: http://en.wikipedia.org/wiki/Old_St._Peter's_Basilica#mediaviewer/File:Affresco_dell%27aspetto_antico_della_basilica_costantiniana_di_san_pietro_nel_IV_secolo.jpg

Old S. Peter's Basilica, Rome Plan of Circus Neronis and Old S. Peter's Basilica Source: http://en.wikipedia.org/wiki/Old_St._Peter's_Basilica#mediaviewer/File:Plan_of_Circus_Neronis_and_St._Peters.gif

Old S. Peter's Basilica, Rome Plan Source: http://commons.wikimedia.org/wiki/File:Old_St_Peters_Basilica_plan.png