which in many cases would become the site of that person's tomb, as in the case of Grimoald (r. 662–671) who built San Ambrogio in Pavia and buried there after his death in 671. Aripert I had the basilica of Santissimo Salvatore built in 657, which became the mausoleum of the kings of the Bavarian dynasty. Perctarit (r. 661–662, 672–688) and his son Cunicpert (r.679–700) built a nunnery and a church at Pavia during their reigns. Lombard churches were sometimes named after those who commissioned their construction, such as San Maria Theodota in Pavia. The monastery of San Michele alla Pusterla located at Pavia was the royal monastery of the Lombard kings. One of the most famous churches built by a Lombard king in Pavia is the church San Pietro in Ciel d'Oro. This famous church was commissioned by king Liutprand (r. 712–744) and it would become the site of his tomb as well as two other famous Christian figures. In building San Pietro in Ciel d'Oro the unit of measurement used by the builders was the length of Liutprand's royal foot. The first important Christian figure interred at San Pietro in Ciel d'Oro was the previously mentioned philosopher Boethius, author of The Consolation of Philosophy, who is located in the cathedral's crypt. The third and largest tomb of the three located in San Pietro in Ciel d'Oro contains the remains of St. Augustine of Hippo. St. Augustine is the early fifth-century Christian writer from Roman North Africa whose works such as On Christian Doctrine revolutionized the way in which the Christian scripture is interpreted and understood. On October 1, 1695, artisans working in San Pietro in Ciel d’Oro rediscovered St. Augustine's remains after lifting up some of the paving stones that compose the cathedral's floor. Liutprand was a very devout Christian and like many of the Lombard kings was zealous about collecting relics of saints. Liutprand paid a great deal to have the relics removed from Cagliari and brought to Pavia so that they would be out of the reach and safe from the Saracens on Sardinia where St. Augustine's remains had been resting. Very little of Liutprand's original church of San Pietro in Ciel d'Oro consecrated by Pope Zacharias in 743 remains today. Originally the roof of its apse was decorated with mosaics, making San Pietro in Ciel d'Oro the first instance of mosaics being used to decorate