Versailles Cathedral is a Roman Catholic cathedral and national monument of France. It is the seat of the Bishop of Versailles, created as a constitutional bishopric in 1790 and confirmed by the Concordat of 1801.
The cathedral was built as the parish church of Saint Louis before becoming the cathedral of the new diocese. The building is of the mid-18th century: the first stone was laid, by Louis XV in 1743 and the church was consecrated in 1754. The architect was Jacques Hardouin-Mansart de Sagonne (1711-1778), a grandson of the famous architect Jules Hardouin-Mansart. In 1764 Louis-François Trouard added the Chapelle des Catéchismes to the northern transept.
During the French Revolution it was used as a Temple of Abundance, and badly defaced.
It was chosen and used as the cathedral by the post-Revolutionary bishop, who preferred it to the church of Notre-Dame in Versailles, which had been the choice of the preceding constitutional bishop. Its consecration as a cathedral was however severely delayed, and was not performed until 1843, by the diocese's third bishop, Louis-Marie-Edmond Blanquart de Bailleul.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.