Ngakolunye uhlangothi lwe Isithangami SamaRoma kumi enye yemengamo edume kakhulu eRoma: the I-Arch kaSeptimius Severus, phansi ezansi kweCapitol Hill. Leli khothamo elinamandla elinemengamo emithathu, elilodwa eliphakathi nendawo nelilandelayo, lakhiwa ngo-203 ngenhloso yokuhlonipha ukunqoba kwezempi kuka-Emperor Septimius Severus namadodana akhe uCaracalla noGeta. I-arch yenziwa ngemabula futhi yonke i-façade ihlotshiswe ngama-bas-reliefs kanye nezinsika.
Ngezansi nje kophahla lwendlu ngayinye yalezi zindawo ezintathu kukhona inganekwane eqoshwe, ukuzinikezela. Ngesikhathi sokwakhiwa kwaso, izinhlamvu zaziqoshwe emigodini, bese zigcwaliswa ngohlamvu ngalunye olwenziwe ngethusi, kodwa zanyamalala kudala. Phezulu kwekhothamo kwakukhona inqola, inqola edonswa ngamahhashi amane, eyayithwala uMbusi namadodana akhe amabili, nayo yayenziwe ngethusi kepha ayisekho lapho, yize lokhu phezulu kungakhuphuka ngesitebhisi .
I-Arch kaSeptimius Severus yandulela i-Arch of Contantino futhi kufanele ngabe isebenze njengesibonelo noma ugqozi. Kuyafaneleka ukusho ukuthi abazalwane bebengazwani kakhulu selokhu uCaracalla wabulala uGeta futhi igama lomfowabo lasulwa emnsalweni.