Around 1313, Friedrich von Meysenburg had a chapel built on the site of current Trinity Church. In 1602, the Dominicans built a monastery around the church. When the Jesuits established themselves nearby and built the Athénée de Luxembourg and the Jesuit church, which is now Notre-Dame Cathedral, the Dominicans moved to the Fishmarket, and in 1628 sold the monastery and church to the Congrégation Notre-Dame des chanoinesses de Saint-Augustin. This order was founded in 1597 in the Duchy of Lotharingia by Alix Le Clerc and the abbot Pierre Fourier.
During the siege of the city by the troops of Louis XIV in 1684, the church and monastery were bombarded and destroyed, but then rebuilt. In 1737 the cornerstone of a new church was placed on the foundations of the old church. This new church, very similar to St. Paulinus' Church in Trier, was the first large Baroque building in the city. In 1745 the church was consecrated to the Holy Trinity by the suffragan bishop of Trier, Lothar Friedrich von Nalbach. It received its first altars in 1770. These are now in Saint Michael's Church, and in the churches of Baschleiden and Everlange. A large painting by Jean-Pierre Sauvage is now in the church of Hellange. These pieces of art from Trinity Church had to be brought to safety in 1795 from French Revolutionary troops.
Until this time, a crypt under the church was used as a burial site. In two rows on top of each other, as in the Roman Catacombs, 32 graves are located, in which 125 canonesses are buried. In the crypt, there are also two grave stones, of the founders of the monastery, namely Anne-Marie von Mansfeld (1585-1657) and Marguerite von Busbach (1579-1651). The crypt was only rediscovered in 1939, under Public Works Minister René Blum, while the church was being renovated.
During the time of the French Revolution, the church was used as a fodder store, a theater, and a decadal temple. After the Congress of Vienna, the Dutch King William I became Grand Duke of Luxembourg in 1815. By royal decree on 20 October 1817, the congregation church was rebuilt by the State as a garrison church for the Protestants among the Prussian garrison troops. Around this military community, a Protestant civil community emerged, composed of civil servants, soldiers, craftsmen, and guest workers.
In 1890, after the Nassau-Weilburg dynasty took over the Luxembourg throne with Grand Duke Adolphe, Trinity Church became the church of Luxembourg's ruling dynasty. The Grand Duke therefore donated three stained-glass windows in 1901 on the east wall. The altar, the sacristy, the pulpit, the monarch's box, the baptismal font and the chandelier were also donated by the Grand Duke.
The organ was built in 1877 by Stumm of Rhaunensulzbach. Donations for the organ came, amongst others, from the Grand Duke of Saxe-Weimar. The organ, renovated in 1998, has 1,350 pipes.
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Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.