1797 and 1799, he lavished money and the finest materials on Brenna's interiors. The reign of Emperor Paul did not last long. He alienated the nobles, and became increasingly fearful of conspiracies. His fears were justified; the Emperor Paul was murdered by members of his court in 1801, and his son Alexander became Emperor. Pavlovsk Palace became the residence of the Empress Maria Feodorovna (1759–1828), the mother of both Emperor Alexander I of Russia and Emperor Nicholas I of Russia. She turned the house into a memorial to her murdered husband, filled with his furniture and portraits, and made the house a showcase for finest 18th-century French furnishings, paintings, sculpture and porcelain. Another disaster struck Pavlovsk in 1803; a fire caused by a defective chimney destroyed a major part of the interior of the palace, including all the decor of the State Apartments and living rooms. Most of the furniture was saved, along with some door panels, fireplaces and mirrors, but most of the Palace had to be rebuilt. Maria Feodorovna brought Cameron and Brenna's young assistant, the Italian architect Carlo Rossi, to help restore the Palace. She also employed a Russian architect, Andrei Voronykhin, who had been born a serf, and was trained in decoration and design, who rose to become the architect of Kazan Cathedral in St. Petersburg. Voronykhin was named chief architect of Pavlovsk by Maria Feodorovna. He brought back the architect Quarenghi, who had redecorated five rooms on the main floor, to recreate his work. He remade some of the rooms, such as the Tapestry Room and the State Bedroom, exactly as they had been, but for other rooms he added decoration inspired by Roman models discovered at Pompeii and Herculaneum; Roman-style lamps, furniture, Roman couches, and chairs copied after those of Roman senators. Following the French taste of the time for Egyptian art, he added black Egyptian statues in the entry vestibule of the Palace, He redesigned the Greek and Italian halls, replacing the molding on the walls with false marble, and he added a Russian touch; fireplaces faced with Russian lapis-lazuli and jasper, which had originally been in the Mikhailovsky Palace that Paul had built in St. Petersburg. Voronykhin also made plans for a semi-circular library in one of the wings, which was later built by Carlo Rossi, and he redesigned the private apartments of Maria Feodorovna on the ground floor, which included a