Rosenfeldt estate was founded by Baron Reinhard von Iselin, a prosperous, Swiss-born landowner, who in 1774 acquired the land when the Crown sold Vordingborg Cavalry District by auction. From 1776 to 1777 he constructed a large farm complex around an octagonal courtyard with the assistance of the architect Christian Joseph Zuber. Iselin's daughter, Anna Elizabeth, inherited Rosenfeldt in 1781. In 1777 she had married the French-born nobleman Antoine de Bosc de la Calmette who in 1783 was appointed prefect of Møn where he owned Marienborg and founded the Liselund estate which he named after his wife.
In 1844 the estate was acquired by captain, general-major Oscar O´Neill Oxholm (1809-1871) who took up residency there with his Irish wife Adelaide Maria O´Kelly. Oxholm constructed the new main building, two farm buildings and 20 fæstegårde. Designed by Henrik Steffens Sibbern, the main building was built from 1868 to 1870. Rosenfeldt Manor is still owned by the Oxholm/Oxholm Tillischs family and covers 2,313 hectares
Rosenfeldt's buildings are arranged around seven of eight sides of Zuber's octagonal courtyard, a layout which is remniscient of that of Amalienborg in Copenhagen. Zuber's original farm complex consists of four low pavilions and two tall stable buildings in Neoclassical style. The plan also reserved a site for the main building which was not built until 1870. Sibbern's main building is constructed in red brick and designed in a Neo-Renaissance style. It consists of a two-story main wing with a tower flanked by two short lateral wings.References:
Royal Palace of Naples was one of the four residences near Naples used by the Bourbon Kings during their rule of the Kingdom of the Two Sicilies (1734-1860): the others were the palaces of Caserta, Capodimonte overlooking Naples, and the third Portici, on the slopes of Vesuvius.
Construction on the present building was begun in the 17th century by the architect Domenico Fontana. Intended to house the King Philip III of Spain on a visit never fulfilled to this part of his kingdom, instead it initially housed the Viceroy Fernando Ruiz de Castro, count of Lemos. By 1616, the facade had been completed, and by 1620, the interior was frescoed by Battistello Caracciolo, Giovanni Balducci, and Belisario Corenzio. The decoration of the Royal Chapel of Assumption was not completed until 1644 by Antonio Picchiatti.
In 1734, with the arrival of Charles III of Spain to Naples, the palace became the royal residence of the Bourbons. On the occasion of his marriage to Maria Amalia of Saxony in 1738, Francesco De Mura and Domenico Antonio Vaccaro helped remodel the interior. Further modernization took place under Ferdinand I of the Two Sicilies. In 1768, on the occasion of his marriage to Maria Carolina of Austria, under the direction of Ferdinando Fuga, the great hall was rebuilt and the court theater added. During the second half of the 18th century, a 'new wing' was added, which in 1927 became the Vittorio Emanuele III National Library. By the 18th century, the royal residence was moved to Reggia of Caserta, as that inland town was more defensible from naval assault, as well as more distant from the often-rebellious populace of Naples.
During the Napoleonic occupation the palace was enriched by Joachim Murat and his wife, Caroline Bonaparte, with Neoclassic decorations and furnishings. However, a fire in 1837 damaged many rooms, and required restoration from 1838 to 1858 under the direction of Gaetano Genovese. Further additions of a Party Wing and a Belvedere were made in this period. At the corner of the palace with San Carlo Theatre, a new facade was created that obscured the viceroyal palace of Pedro de Toledo.
In 1922, it was decided to transfer here the contents of the National Library. The transfer of library collections was made by 1925.
The library suffered from bombing during World War II and the subsequent military occupation of the building caused serious damage. Today, the palace and adjacent grounds house the famous Teatro San Carlo, the smaller Teatrino di Corte (recently restored), the Biblioteca Nazionale Vittorio Emanuele III, a museum, and offices, including those of the regional tourist board.