library, boudoir and bedroom. He installed French doors and large windows in the apartment, so the flower garden outside seemed to be part of the interior. In 1805 Voronykhin built the Centaur bridge in the park, and the Visconti bridge, which crossed the Slavyanka at a point it was filled with water lilies. His last construction in the park was the Rose Pavilion, built in 1811, a simple structure surrounded entirely by rosebushes. The Rose Pavilion was the site of a grand fete on 12 July 1814, celebrating the return of Alexander I to St. Petersburg after the defeat of Napoleon. For the occasion, architect Pietro de Gottardo Gonzaga built a ballroom the size of the Rose Pavilion itself in just seventeen days, and surrounded it with huge canvases of Russian villagers celebrating the victory. The ball inside the pavilion opened with a Polonaise led by Alexander and his mother, and ended with a huge display of fireworks. In her later years Maria Feodorovna had a literary salon at Pavlovsk, which was frequented by poet Vasily Zhukovsky, fabulist Ivan Krylov, and historian Nikolai Karamzin. The last great St. Petersburg architect to work at Pavlovsk was Carlo Rossi, who in 1824 designed the library, which contained more than twenty thousand books as well as collections of rare coins and butterflies. He also designed the Corner Salon, where Maria Feodorovna received guests such as the first American Ambassador to Russia, John Quincy Adams, and the Lavender Room, whose walls were made of lilac-colored false marble, matching the lilac flowers outside the windows. These rooms were furnished with furniture made of native Russian woods, including Karelian birch, poplar and walnut. Later history Maria Feodorovna died on 24 October 1828, fourteen days after her sixty-seventh birthday. She left the house to her younger son, Michael, and specified that none of the furniture should be taken away. After Michael's death, it went to the second son of Nicholas I, Konstantine Nikolayevich. It then passed to his widow and then their eldest son, Konstantine Konstantinovich. Her descendants respected the will, and turned the house into a family museum, just as it was when she died. Russian Revolution At the time of the Russian Revolution in 1917, the eldest son of Constantine Constantinovich, Prince Ioann Konstantinovich of Russia, along with his wife, Princess Helen of Serbia, the daughter of King Peter I of Serbia, were living in