▁In ▁front ▁of ▁the ▁church ▁stands ▁the ▁Ob el is co ▁S all ust iano , ▁one ▁of ▁the ▁many ▁ob el is ks ▁in ▁Rome , ▁moved ▁here ▁in ▁ 1 7 8 9 . ▁It ▁is ▁a ▁Roman ▁ob el isk ▁in ▁im itation ▁of ▁Egypt ian ▁ones , ▁originally ▁constructed ▁in ▁the ▁early ▁years ▁of ▁the ▁Roman ▁Empire ▁for ▁the ▁Gard ens ▁of ▁S all ust ▁near ▁the ▁Port a ▁Sal aria . ▁The ▁hier og lyph ic ▁ins cription ▁was ▁copied ▁from ▁that ▁on ▁the ▁ob el isk ▁in ▁the ▁Pia zza ▁del ▁Pop olo ▁known ▁as ▁Fl amin io ▁Ob el isk . ▁ ▁During ▁the ▁Napole onic ▁occupation ▁of ▁Rome , ▁the ▁church , ▁like ▁many ▁others , ▁was ▁des po iled ▁of ▁its ▁art ▁and ▁decor ations . ▁In ▁ 1 8 1 6 , ▁after ▁the ▁Bour bon ▁rest oration , ▁the ▁church ▁was ▁restored ▁at ▁the ▁exp ense ▁of ▁Louis ▁XVIII . ▁ ▁The ▁ins cri ptions ▁found ▁in ▁Sant iss ima ▁Tr init à ▁dei ▁Mont i , ▁a ▁valuable ▁source ▁illustr ating ▁the ▁history ▁of ▁the ▁church , ▁have ▁been ▁collected ▁and ▁published ▁by ▁V inc en zo ▁For cel la . ▁ ▁Inter ior ▁In ▁the ▁first ▁chap el ▁to ▁the ▁right ▁is ▁a ▁Bapt ism ▁of ▁Christ ▁and ▁other ▁scenes ▁of ▁the ▁life ▁of ▁John ▁the ▁Bapt ist ▁by ▁the ▁Flor ent ine ▁M anner ist ▁painter ▁Gi amb att ista ▁N ald ini . ▁In ▁the ▁third ▁chap el