This princely tomb, unlike other Tarquinian large mounds, contains two aligned rooms and a very large entrance. Both the funerary chambers, which have a rectangular and elongated plan, were constructed entirely of limestone and tuff blocks arranged in ordered rows. The first room has a covering with an ogival profile, formed by progressively projecting blocks; instead in the second one the pseudo-vault is always made with projecting blocks, but here they maintain a "steps" profile and they save a slit at the top. This sort of negative columen is marked by two stone beams set widthways at one third and two thirds of the length, placed to support the slabs closing the vault.