Question: In what year was the emperor of whom Elizaveta Vorontsova was a mistress born?
Sentence (from "Peter III of Russia"): Peter III (21 February 1728 – 17 July [O.S. 6 July] 1762 ) (Russian: Пётр III Фëдорович, "Pyotr III Fyodorovich" ) was emperor of Russia for six months in 1762.
Relevant evidence: Yes