San Pietro in Ciel d’Oro stands on an ancient Lombard temple, probably the same place where Theodoric, the Ostrogoth king, had the Roman philosopher Severinus Boethius, accused of treason, killed and buried. The present Romanesque basilica was built in the late 11th and early 12th centuries and experienced its heyday under the Lombard king Liutprand, who transferred the remains of the bishop Saint Augustine here. The Saint’s relics are housed in a 14th-century marble Ark, built in Gothic style and divided into three levels: the basement with figures of apostles and saints, a cell supported by pillars under which the Saint’s marble body rests, and the crowning composed of triangular tympanums depicting the miracles performed by Saint Augustine. The name of the church is said to derive from an earlier interior decoration in which the ceiling and dome were gilded and which was probably lost due to some interventions in the 15th century.