Felix Yusupov, the last representative of his lineage, was married to a relative of the emperor and possessed a fortune that surpassed that of the tsar. He became known for his involvement in the assassination of Grigori Rasputin.

Felix Felixovich was born into the family of General and Count Felix Felixovich Sumarokov-Elston and Princess Zinaida Nikolaevna Yusupova. After receiving an excellent education in Russia and England, he became the sole heir to the vast Yusupov fortune following the death of his brother Nikolai in a duel. The Yusupov family, descending from Nogai princes, ended in the male line in 1891, and to preserve the surname, Felix's father was granted the title of Prince Yusupov, which was an extremely rare occurrence.

From a young age, Felix Yusupov displayed extraordinary talents, was passionate about theater, and participated in productions, which allowed him to meet outstanding figures of Russian culture such as Vertinsky, Karsavina, and Chaliapin. In 1914, he married Princess Irina Alexandrovna, the emperor's niece. After the wedding, they traveled to Germany, and with the onset of World War I, they nearly became hostages, but thanks to diplomats, they returned to Russia, where their daughter Irina was soon born.

During those years, Yusupov met Rasputin. According to contemporaries, they initially even became friends, and the young prince found himself under Grigori's influence, but later their relationship soured, and Felix took part in Rasputin's assassination. After the revolution, Yusupov and his family left for Crimea and, miraculously escaping retribution, permanently left Russia in 1919. In exile, he lived in France, engaged in business with varying success, and died on September 27, 1967, in Paris. He was buried at the Sainte-Geneviève-des-Bois cemetery. His wife outlived him by three years and passed away on February 26, 1970. The Yusupov lineage has ended again, and the closest descendant now is his granddaughter Ksenia Nikolaevna Sphirs, daughter of Irina Felixovna Yusupova and Count Sheremetev.