succeeded by his second and only living son, Boris, since their elder son, Nikolai, died in infancy. At the age of 42, Prince Boris Nikolaievich Yusupov (9 June 1794, Moscow – 25 October 1849, Arkhangelskoye Estate), Marshal of the Imperial Court, inherited his immense family wealth, including more than 675,000 acres (2730 km²) of land and more than 40,000 serfs living on it. But unlike his father, Boris was not a patron of the arts. Instead, he was primarily occupied with business concerns. Boris moved to the Moika palace in St. Petersburg (also known as Yusupov Palace) with his second wife, Zenaida Ivanovna Narishkina (18 May 1810 – 26 February 1893), a descendant of the same house as Peter the Great's mother, and their only son Nikolai. The Arkhangelskoye palace was soon derelict; the animals in the palace zoo were sold and much of the collection moved. Boris focused on the family granaries and developed good relationships with the peasants who worked in them. He died in 1849. Boris's only son, Prince Nikolai Borisovich Yusupov (12 October 1827, Moscow – 31 July 1891, Baden-Baden), Marshal of the Imperial Court, was much like his uncle Nicholas I, a patron of the arts. He first served in Nicholas's chancery. Nikolai bought a large collection of jewellery, including a 36 carat (7.2 g) diamond known as the Morocco Sultan. The prince later spent much of his time in Southern Europe due to poor health, while also serving the tsar as a diplomat. While in Europe, he bought much to adorn his palace on the Moika, including collections of violins and paintings. He married Countess Tatiana Alexandrovna de Ribeaupierre (29 June 1828 – 14 January 1879), a lady-in-waiting to the Empress, daughter of Comte Alexandre de Ribeaupierre and his wife Ekaterina Mikhailovna Potemkina, another niece of Prince Potemkin. The prince was also a talented musician and composer and was a member of several musical societies. In 1866, he published a book about Yusupov family history, On the Family of the Yusupov Princes: A Collection of Their Life Stories, Charters and Letters of the Russian Sovereigns to Them. 20th century When Nicholas Yusupov died in 1891, he was succeeded by his daughter, Zinaida, who was considered a legendary beauty at the time, as well as one of the richest women in the country. Her suitors included the crown prince of Bulgaria. Princess Zinaida Nikolaievna Yusupova