Alimfuata [[Papa Hilarius]] akafuatwa na [[Papa Felix III]].
Alitetea maamuzi ya [[Mtaguso wa Kalsedonia]] kwa kupinga [[uzushi]] wa [[Eutike]]<ref>Thiel, p. 174 §2. Loomis, pp. 97-99; 106 note 2.</ref> In 478, Simplicius held a synod in Rome, which pronounced anathemas against eastern heretical bishops Peter Fullo, John of Apamea, and Paul of Ephesus.<ref>{{cite book|author=Karl Joseph von Hefele|editor=W. R. Clark|title=A History of the Councils of the Church, from the Original Documents|url=https://books.google.com/books?id=09NEAAAAYAAJ|volume=IV.|year=1895|publisher=T. & T. Clark|location=Edinburgh|pages=26–29}} In a letter which Thiel (pp. 189-192) dated to October 477, Pope Simplicius wrote to the Patriarch Acacius about what he thought should be done about the heretic bishops.</ref> na alijitahidi kudhibiti matokeo ya [[uvamizi]] wa [[Wagermanik|makabila ya Kigermanik]] walioteka [[Roma]] yenyewe na kumweka [[mfalme]] wa kwao, [[Odoakre]], badala ya [[Kaizari|kaisari]] [[Romulus Augustus]] ([[476]])<ref>[http://www.sacred-texts.com/chr/lots/lots077.htm Butler, Alban.''Lives of the Saints'', Benziger Bros. 1894] </ref> pamoja na kudumisha [[mamlaka]] ya [[Kanisa la Roma]] katika [[Kanisa la Magharibi|Ukristo wa Magharibi]]<ref name="ce=simplicious"/><ref>Thiel, pp. 213-214.</ref><ref>Thiel, pp. 201-202. Kehr, Paul Fridolin (1906), ''Italia Pontificia'' [https://archive.org/details/italiapontificia05cath Vol. V: Aemilia, sive Provincia Ravennas] (Berlin: Weidmann), pp. (in Latin). p. 301 no. 1. Lanzoni, Francesco (1927). ''[https://archive.org/stream/MN5017ucmf_0#page/n281/mode/2up Le diocesi d'Italia dalle origini al principio del secolo VII (an. 604)]'' (Faenza: F. Lega), p. 793, no. 4. {{it}}</ref>.
