The Pyramid of Cestius (in Italian, Piramide di Caio Cestio or Piramide Cestia) is an ancient pyramid in Rome, Italy, near the Porta San Paolo and the Protestant Cemetery.Due to its incorporation into the city's fortifications, it is today one of the best-preserved ancient buildings in Rome. The pyramid was built about 18 BC-12 BC as a tomb for Gaius Cestius, a magistrate and member of one of the four great religious corporations in Rome, the Septemviri Epulonum. It is of brick-faced concrete covered with slabs of white marble standing on a travertine foundation.