Hautvillers Abbey is a former Benedictine monastery in the Hautvillers commune of the Marne department in north-eastern France. The abbey remained active between 665 and the French Revolution of 1789. It housed the relics of Saint Helena, Empress and mother of Constantine, between 841 and 1819. One of its monks, Dom Pérignon, contributed to the development of sparkling wine in the Champagne region.
The abbey was founded in 650 by Saint Nivard, Bishop of Reims. According to legend, a dove indicated where to build an abbey that would follow the order of Saint Benedict and Saint Columbanus. The abbey flourished under the Carolingian Dynasty and drew great renown thanks to its manuscripts, such as the Ebbo Gospels and perhaps the Utrecht Psalter.
Saint Rieul joined the abbey in 662, before succeeding Saint Nivard as Archbishop of Reims in 669. In 841 a priest from Reims stole the relic of the body of Saint Helena from Rome and the reliquary was transferred to the abbey. The relics attracted pilgrims and the revenues allowed the abbey to purchase lands and vineyards in the vicinity (40 hectares).
The remaining relics of St. Helena stayed in the monastery until the French Revolution broke out. The monastery was destroyed but the cellarer was able to hide the relics until they could be safely transported to Paris for public veneration again. They were then entrusted to the Knights of the Holy Sepulchre and installed in their church, Saint-Leu-Saint-Gilles de Paris,in 1819.
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.