Susteren Abbey is a former Benedictine abbey founded in the 8th century. Early in 714 Pepin of Herstal and his wife Plectrude sent Saint Willibrord letters of conveyance and protection for the monastery, permitting free election of abbots. The Benedictine foundation served as a refuge for the missionaries working in Friesia and the Netherlands. The abbey was destroyed by the Vikings in 882 and refounded as a house of secular canonesses, whose first abbess was Saint Amelberga of Susteren, who died about 900.
The Lotharingian King Zwentibold, a benefactor of the abbey and either the father or the brother of the abbesses Benedicta and Cecilia, was buried (according to a later tradition) in Susteren Abbey in about 900. Also buried there are Saint Wastrada, who died in the mid-8th century, and Saint Gregory of Utrecht (d. about 775/777), a companion of Saint Boniface in his missions to Friesia, and later abbot of the Martinsstift in Utrecht.
The abbey was suppressed at the end of the 18th century when the French Revolution spilled over into the Low Countries. The church alone remains. The abbey church, one of the major examples of Romanesque architecture in the Netherlands, although marred by a poor restoration in 1885-1890, was built in the 11th century. It was clearly influenced by the Ottonian minster church of Essen Abbey. It was dedicated to Amelberga in 1886, after authentication of the relics kept here. On 6 September 2007 the church was declared a basilica minor.
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.