otto ▁returned ▁to ▁Florence . ▁ ▁A ▁document ▁from ▁ 1 3 1 3 ▁about ▁his ▁furn iture ▁there ▁shows ▁that ▁he ▁had ▁spent ▁a ▁period ▁in ▁Rome ▁some ▁time ▁before hand . ▁It ▁is ▁now ▁thought ▁that ▁he ▁produced ▁the ▁design ▁for ▁the ▁famous ▁Nav ic ella ▁m osa ic ▁for ▁the ▁cour ty ard ▁of ▁the ▁Old ▁St . ▁Peter ' s ▁Bas il ica ▁in ▁ 1 3 1 0 , ▁commission ed ▁by ▁Card inal ▁Gia como ▁or ▁Jac opo ▁Stefan esch i ▁and ▁now ▁lost ▁to ▁the ▁Renaissance ▁church ▁except ▁for ▁some ▁fragments ▁and ▁a ▁Bar o que ▁reconst ruction . ▁According ▁to ▁the ▁cardinal ' s ▁ne cro log y , ▁he ▁also ▁at ▁least ▁designed ▁the ▁Stefan esch i ▁Tri pty ch ▁( c .   1 3 2 0 ) ▁, ▁a ▁double - s ided ▁alt arp ie ce ▁for ▁St . ▁Peter ' s , ▁now ▁in ▁the ▁V at ican ▁Pin ac oteca . ▁It ▁shows ▁St ▁Peter ▁ent hr oned ▁with ▁sain ts ▁on ▁the ▁front , ▁and ▁on ▁the ▁reverse , ▁Christ ▁is ▁ent hr oned , ▁fr amed ▁with ▁scenes ▁of ▁the ▁mart yr dom ▁of ▁Sain ts ▁Peter ▁and ▁Paul . ▁It ▁is ▁one ▁of ▁the ▁few ▁works ▁by ▁Gi otto ▁for ▁which ▁firm ▁evidence ▁of ▁a ▁commission ▁exists . ▁However , ▁the ▁style ▁seems ▁unlikely ▁for ▁either ▁Gi otto ▁or ▁his ▁normal ▁Flor ent ine ▁assist ants ▁so ▁he ▁may ▁have ▁had ▁his ▁design ▁executed ▁by ▁an