The Mausoleum of Theoderic (Italian: Mausoleo di Teodorico) is an ancient monument just outside Ravenna, Italy. It was built in 520 AD by Theoderic the Great as his future tomb. The current structure of the mausoleum is divided into two decagonal orders, one above the other; both are made of Istria stone. Its roof is a single 300–ton Istrian stone, 10 meters in diameterA niche leads down to a room that was probably a chapel for funeral liturgies; a stair leads to the upper floor. Located in the centre of the floor is a circular porphyry stone grave, in which Theoderic was buried.