Prince (Reichsfürst) Platon Alexandrovich Zubov (Russian: Платон Александрович Зубов; November 26 [O.S. November 15] 1767 – April 19 [O.S. April 7] 1822) was the last of Catherine the Great's favourites and the most powerful man in Russian Empire during the last years of her reign.
The prince was a member of the Zubov family and had several siblings, including Nicholas, Valerian, and Olga Zherebtsova. It was through his distant relative, Russian Field Marshal Nicholas Saltykov, that he met the Empress. Saltykov presented the young officer at court on the understanding that Zubov would then help Saltykov in his feud with Catherine's long-standing favourite, Prince Potemkin.
In August 1789, Catherine wrote to Potemkin that she returned to life after a long winter slumber "as a fly does". "Now I am well and gay again," she added, telling about her new friend, "a dark, little one". "Our baby," as she called him, "weeps when denied the entry into my room," Catherine informed Potemkin in the next letter. As young minions succeeded each other monthly in Catherine's heart, Potemkin did not attach importance to her new liaison. Catherine was over 60, Zubov was just 22. The old courtier did not believe that the connection would last for an extended period of time.
Zubov, however, managed to establish a strong hold of Catherine's affections and character. In 7 years, he was made a Count and then a Reichsfurst, or Prince of the Holy Roman Empire, becoming the fourth (and last) Russian to receive the title. Upon Potemkin's death, Zubov succeeded him as the Governor-General of New Russia. As Fyodor Rostopchin reported to Semyon Vorontsov on August 20, 1795, "Count Zubov is everything here. There is no other will but his. His power is greater than that of Potemkin. He is as reckless and incapable as before, although the Empress keeps repeating that he is the greatest genius the history of Russia has known".