Witold Pilecki
Witold Pilecki (Polish: [ˈvitɔlt piˈlɛt͡skʲi] ; 13 May 1901 – 25 May 1948), known by the codenames Roman Jezierski, Tomasz Serafiński, Druh and Witold, was a Polish World War II cavalry officer, intelligence agent, and resistance leader. As a youth, Pilecki joined Polish underground scouting; in the aftermath of World War I, he joined the Polish militia and, later, the Polish Army.