Identify.

Columbarium of Pomponius Hylas, ca 14-54 CE, underground, carved out of bedrock, three niches (1 held freedman of Tiberius and 1 Claudia Octavia), freedman obtaining name/recalling relationship to imperial family, freedman Pomponius Hylas bought and decorated the columbarium, people outside of his family still use it, mosaic (has an inscription identifying him, griffins facing each other - apatropaic), painting (blue - expensive) of myth scenes, elements carved into it to look like a shrine