The church of Notre-Dame was founded around 1060 by Robert I of Vitré and donated in 1116 to the Abbey of Saint-Melaine in Rennes. It was almost entirely rebuilt in the 15th and 16th centuries: only the choir remains of the old church, whose windows were modified in the 15th century. The southern façade, built in two campaigns (1480-1500 and 1530-1540) has seven gables separated by pinnacle buttresses. It is adorned with a beautiful pulpit for preaching. The west façade dates from the 1580s, its door has kept its original leaves, dated 1586. The collateral and the north crosspiece were rebuilt in 1467. The spire of the central tower (1420-1442) was rebuilt in stone in 1858.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.