The main Roman palace, decorated by Simone Martini and Mateo Giovanni, looks like a very primitive Castle overlooking the city, its walls and the bridge across the Rona River left over from the 12th century. On the square beneath this prominent Gothic building, small palaces and the Roman Catholic Church of Notre Dame constitute a special group of monuments that demonstrate Avignon's prominent role in the Christian Europe of the 14th century. From 1309 to 1377, in the past 60 years and 70 years, there were seven popes living here. In order to show the holiness and dignity of the pope, in the high rocky mountains in the north of the city, the total area was 15,000 square meters, which was joined by the old palace and the new palace.