Arch of Septimus Severus
The sons were Caracalla and Geta. After the death of Septimius Severus, his sons were initially joint emperors. Caracalla had Geta assassinated in 212; Geta's memorials were destroyed. All images or mentions of him were removed from public buildings and monuments. So, Geta's image and inscriptions were removed from the arch (damnatio memoriae).