Located in one of the external courtyards of the Bourbon Prison, near the first male pavilion, the lapidary of the Museo Irpino is mainly made up by numerous sepulchral epigraphs, honorary inscriptions of a sacred and public nature, architectural fragments belonging to public works, as well as by signatures, initials, marks and sarcophagi.
The origin is varied and involves the whole territory of Irpinia, and the chronology of these findings is extended: it goes from the 1st century BC up to the Middle Ages. There is an imposing funerary stele dating back to the same period, over two metres long, on which a knight armed with a sword and a large shield with the de Sus family heraldic symbol is depicted in a bas-relief: this is Luigi de Sus, who arrived to Italy with Charles I of Anjou in 1282 for the conquest of the Kingdom of Naples, later became vicar and general governor of the county of Avellino, and is considered the forefather of the Bellabona family. The slab was probably the tombstone that his son, Roberto, had built in the church of San Francesco in Largo di Avellino.
A part of the stone material is also located in the exhibition of the archaeological section of the Museo Irpino at Palazzo della Cultura. There are statues, funerary epigraphs and celebratory inscriptions. Of particular importance is a long inscription with a dedication to the god Silvanus, also known as Faunus in the public worship. He lived in the woods and was the protector of nature and agricultural activities. Discovered in the area of Oppido, in Lioni towards Caposele, the stele dates back to the 1st century AD.