S. Silvestro PP. Constantino Mag. imp. Christus dei Filius patri consubstantialis declaratur Arii impietas condemnatur. _The burning of the books of Arius._ Ex decreto concilii Constantinus Imp. libros Arianorum comburi iubet. III. CONCILIUM CONSTANTINOPOLITANUM I. _The first Council held at Constantinople_, A.D. 381. S. Damaso PP. et Theodosio sen. imp. Spiritus Sancti divinitas propugnatur nefaria Macedonii haeresis extinguitur. IV. CONCILIUM EPHESINUM. _The Council held at Ephesus_, A.D. 431. S. Caelestino PP. et Theodosio Jun. Imp. Nestorius Christum dividens damnatur, B. Maria Virgo dei genetrix praedicatur. V. CONCILIUM CHALCEDONENSE. _The Council held at Chalcedon_, A.D. 451. S. Leone magno PP. et Marciano Imp. infelix Eutyches vnam tantum in Christo post incarnationem naturam asserens confutatur. VI. CONCILIUM CONSTANTINOPOLITANUM II. _The second Council held at Constantinople_, A.D. 553. Vigilio Papa et Iustiniano Imp. contentiones de tribus capitibus sedantur Origenis errores refelluntur. VII. CONCILIUM CONSTANTINOPOLITANUM III. _The third Council held at Constantinople_, A.D. 680. S. Agathone Papa Constantino pogonato Imp. monothelitae haeretici vnam tantum in Christo voluntatem docentes exploduntur. VIII. CONCILIUM NICAENUM II. _The second Council held at Nicaea_, A.D. 787. Hadriano papa Constantino Irenes F. imp. impii iconomachi reiiciuntur sacrarum imaginum veneratio confirmatur. IX. X. CONCILIUM CONSTANTINOPOLITANUM IV. _The fourth Council held at Constantinople_, A.D. 869. Hadriano papa et Basilio imp. S. Ignatius patriarcha Constant. in suam sedem pulso Photio restituitur. _The burning of the books of Photius._ Ex decreto concilii Basilius Imp. chirographa Photii et conciliab. acta comburi iubet. In conclusion I will enumerate the series of eighteen large pictures on the side-walls and in the lunettes at each end of the room, representing, with some few exceptions, the benefits conferred on Rome by Sixtus. The most important of these pictures are above the windows (fig. 16), of which there are seven on each side-wall. A Latin couplet above the picture records the subject, and allegorical figures of heroic size, one on each side, further indicate the idea which it is intended to convey. The series begins at the east end of the room, over the door. I. _Procession of Sixtus to his coronation._ Hic tria Sixte tuo capiti diademata dantur Sed quantum in coelis te diadema manet. ELECTIO SACRA. MANIFESTATIO. On the left of this, over the First Nicene Council, is II. _Coronation of Sixtus, with facade of old S. Peter's._ Ad templum antipodes Sixtum comitantur euntem Jamque novus Pastor pascit ovile novum. HONOR. DIGNITAS. With the following picture the series on the south wall begins, above the windows: