Short answers, pulled from the story.
Junius Bassus served as consul of Rome in 331 when he commissioned the civil basilica on the Esquiline Hill. Historical records confirm his role in its construction during that specific year of office.
Pope Simplicius oversaw the transformation of this civil space into Sant'Andrea Catabarbara church in the second half of the fifth century. The original civic purpose faded as Christian worship took hold within these walls.
The basilica remains best known for examples of opus sectile work found inside featuring panels such as a tiger attacking a calf from the second quarter of the fourth century CE. Such artwork demonstrated high Roman craftsmanship and artistic ambition.
Archaeologists rediscovered the last remains of the basilica in 1930 before workers demolished what little stood above ground that same year. Excavations at the site revealed an Augustan house containing later rebuilding phases.
Today, these specific mosaics are on show in the seminary located nearby where the Seminario Pontificio di Studi Orientali now stands. They preserve the identity of families who once lived in this part of the city including Arippii and Ulpii Vibii.