Nicholas Salos of Pskov was a Russian holy fool, known as a yurodivy, who lived in the 16th century. Born around 1501, he is most famous for his courageous intervention during a military siege in 1570. When Tsar Ivan the Terrible targeted Pskov due to suspicions of treason, Nicholas confronted the monarch directly. By rebuking the ruler for his violent actions, he is credited with preventing a massive massacre of the city's population.