Origin and history
The Priory Saint-Louis de Poissy was founded in 1304 by Philippe le Bel in honour of his grandfather, Saint Louis, shortly after his canonization in 1297. Located in Poissy, the king's birthplace, he replaced the château-neuf near the collegiate Notre-Dame. This royal monastery, entrusted to Dominicans assisted by Dominican fathers, became one of the richest in France, housing up to 200 nuns from the nobility. His church, dedicated to Saint Louis, was inaugurated in 1331 in the presence of twenty-two bishops and two archbishops, and contained an invaluable liturgical treasure, including reliquaries, statues and illuminated manuscripts such as the Breviary of Saint-Louis de Poissy.
The priory played a major political and religious role, hosting events such as the Poissy symposium in 1561, where Catholics and Protestants debated in the presence of Charles IX and Catherine de Medici. Its decline began in the seventeenth century, marked by scandals and reforms imposed by Pope Urban VIII. The French Revolution sealed its fate: evacuated in 1792, the monastery was sold as a national property and almost entirely demolished. Only the doorway, classified as a historical monument in 1933, remains today, home to the Toy Museum.
The 95-metre-long, 30-metre-high prioral church was a Gothic masterpiece decorated with royal statues, stained glass windows and a altarpiece offered by Jean de Berry, now preserved at the Louvre. Damaged by lightning in 1695, it was restored by Jules Hardouin-Mansart and Robert de Cotte in a late Gothic style. His treasures included reliquaries in gold and silver, such as the one containing the skull of Saint Louis, as well as tapestries and manuscripts, some of which were now scattered in French museums. The estate spanned 48 hectares, including a royal residence, gardens and pools, symbolizing the fascist of a monastery linked to the crown.
Prioresses, often from the aristocracy, marked its history, such as Marie de Bourbon-Clermont (1334–1372) or Louise de Gondi (1623–1661), daughter of Henry IV. The priory also welcomed illustrious personalities, such as Marie de France, daughter of Charles VI, or Christine de Pisan, who came to finish his days with his daughter. Royal figures like Philip the Bel, Charles VII or Henry IV stayed there, strengthening his status as a place of power. After its destruction, its remains, including statues and architectural elements, were dispersed, while the porterie, the last witness, became a symbol of the fish heritage.
The priory was also a place of burial for members of the royal family, such as the heart of Philip the Bel, deposited in a ballot box in 1687, or Robert of France, son of Saint Louis. Its decline accelerated with the wars of Religion and the excesses of nuns in the seventeenth century, leading to strict reforms. The sale of materials after 1797 completed its destruction, leaving only archaeological traces and scattered works of art, such as the angels of the museum of Cluny or the altarpiece of the Louvre. Today, the site is a place of memory, evoking both medieval piety and revolutionary upheavals.
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