The Mausoleum of Hadrian, usually known as Castel Sant'Angelo, is a towering cylindrical building in Parco Adriano. It was initially commissioned by the Roman EmperorHadrian as a mausoleum for himself and his family. The building was later used by the popes as a fortress and castle, and is now a museum. The tomb of the Roman emperor Hadrian, also called Hadrian's mole, was erected on the right bank of the Tiber, between 134 and 139 AD. Originally the mausoleum was a decorated cylinder, with a garden top and golden quadriga. Hadrian's ashes were placed here a year after his death in Baiae in 138, together with those of his wife Sabina, and his first adopted son, Lucius Aelius.