classical elements. In 1810, the rooms on the beletage were remodeled in the Neoclassical style, but they were restored to the Baroque style and opened as a museum in the 1950s. The apartments of Frederick Louis and Charles Alexander were decorated by Frisoni and Colomba, but Charles Alexander's apartment also features a landscape painting by Adolf Friedrich Harper. Directly south of the Riesenbau is the Östlicher Kavalierbau (East Cavaliers' Building), built from 1715 to 1719 for housing courtiers. It contains four apartments on both floors, decorated with stucco ornament by Riccardo Retti and an original fresco on the ceiling of the beletage by Leopoldo Retti. The southwestern apartment on the second floor contains a museum dedicated to the Schlosstheater (Palace theater), attached by a gallery to the Östlicher Kavalierbau and the Schlosskapelle. Europe's oldest theater was constructed by Frisoni from 1729 to 1733 but was first furnished in 1758–59 by La Guêpière, who added the stage, auditorium, and machinery. Thouret remodeled the Schlosstheater in Neoclassical in 1811–12. Casanova is known to have visited the Schlosstheater, making notes on the performances held there. The Schlosskapelle (Palace chapel) was built from 1716 to 1724. The chapel is made up of a rotunda with three semi-domes and a private box for the duke and his family, accessed from the second floor. The box was painted around 1731 with the story of David and given its red velvet wallpaper and a ceiling fresco by Livio Retti. The chapel was painted by Frisoni, Colomba, and Carlo Carlone, who were restricted by Protestant doctrine to illustrations of biblical topics, such as the Apostles and scenes from the Old Testament. A crypt under the chapel is the burial site of all rulers of Württemberg from Duke Eberhard Louis to King Frederick I. The Schlosskapelle did not receive any major remodeling in the 19th century. The southernmost part of the east wing is the Ahnengalerie, built in 1729 and long. The original ceiling frescoes by Carlo Carlone, which illustrate the story of Achilles, were moved to the Bildergalerie after their completion in 1732. Instead, Carlone painted an homage to Eberhard Louis from 1731 to 1733, glorifying his reign with depictions of Alexander the Great, Apelles, Venus, Mars, Apollo, Phobos, and the Muses, among others. Frederick I had Thouret remodel the Ahnengalerie in 1805–06, retaining Carlone's frescoes and adding stucco to the two antechambers. The portraits in the Ahnengalerie