In 1515, Raphael was commissioned by Pope Leo X to design a series of ten tapestries to hang around the lower tier of the walls. The tapestries depict events from the "Life of St. Peter" and the "Life of St. Paul", the founders of the Christian Church in Rome, as described in the Gospels and the Acts of the Apostles. Work began in mid-1515. Due to their large size, manufacture of the hangings was carried out in Brussels, and took four years under the hands of the weavers in the shop of Pieter van Aelst. Raphael's tapestries were looted during the Sack of Rome in 1527 and were either burnt for their precious metal content or were scattered around Europe. In the late 20th century, a set was reassembled from several further sets that had been made after the first set, and displayed again in the Sistine Chapel in 1983. The tapestries continue in use at occasional ceremonies of particular importance. The full-size preparatory cartoons for seven of the ten tapestries are known as the Raphael Cartoons and are in London.