The Benedictine Abbey of Saint-Germain-des-Prés was the burial place of Merovingian kings of Neustria. The Abbey was founded in the 6th century by Childebert I, the son of Clovis I (ruled 511–558). Under royal patronage the Abbey became one of the richest in France; it housed an important scriptorium in the 11th century and remained a center of intellectual life in the French Catholic church until it was disbanded during the French Revolution.
The church was frequently plundered and set on fire by the Normans in the 9th century. It was rebuilt in 1014 and rededicated in 1163 by Pope Alexander III to Saint Germain of Paris, the canonized Bishop of Paris and Childeric"s chief counsellor. A new refectory was built for the monastery by Peter of Montereau in around 1239 - he was later the architect of the Sainte-Chapelle.
The abbey church"s west end tower was pierced by a portal, completed in the 12th century, which collapsed in 1604 and was replaced in 1606 by the present classicising portal, by Marcel Le Roy. Its choir, with its apsidal east end, provides an early example of flying buttresses. An explosion of saltpetre in storage levelled the Abbey and its cloisters, the statues in the portal were removed (illustration) and some destroyed, and in a fire in 1794 the library vanished in smoke.
Until the late 17th century, the Abbey owned most of the land in the Left Bank west of the current Boulevard Saint-Michel and had administrative autonomy in it, most clearly for the part outside the walls of Paris.
The tomb of philosopher René Descartes is located in one of the church"s side chapels.
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.