Catacombs of Marcellinus and Peter

From Wikipedia:

The Catacombs of Marcellinus and Peter are found approximately three kilometers from southeast Rome and the ancient Via Labicana, and date to the 4th century AD.^[1] The catacombs were named in reference to the Christian martyrs Marcellinus and Peter who may have been buried there according to legend, near the body of St. Tiburtius.^[2]

During excavations performed from 2004 to 2010, an estimated 20,000 skeletons were discovered in these catacombs; the skeletons were buried in loculi (individually buried within a niche), arcosolia (a burial under an arched recess), or cubicala (individuals grouped together into a burial chamber).^[1] The catacombs “cover 3 hectares with 4.5 kilometers of subterranean galleries on three different levels”.^[1]

Within the catacombs is a variety of frescoes representative of pagan and Christian traditions and a few small artifacts. The significance of the pieces of art can be traced to the time period they were commissioned and some possible influence from the inhabitants of the catacombs.