Monumental tomb built in about 20 BC with a diameter of about 34 m (112 feet)
It was discovered in 1887. It belonged to the military tribune, and prefect of the genius commander of the cavalry Lucilius Paetus and his sister Lucilia Polla
It is covered with travertine marble and there is a small burial chamber with a cross vault and three niches for three funeral beds of which only one is preserved
In the fourth century under the tomb a small catacomb was excavated
