Kuksha of the Kyiv Caves was an Eastern Orthodox hieromartyr who lived during the early 12th century. A monk at the Kyiv Pechersk Lavra, he is primarily recognized for his missionary efforts among the Vyatichi people in territories that now comprise the Kaluga, Ryazan, and Tula regions. His preaching and reported miracles led many idol-worshippers to embrace Christianity. This religious transformation eventually led to his death at the hands of local priests who were angered by the destruction of their idols.