Hungary's regent for nearly a quarter century, Horthy presided over a state that institutionalized antisemitism throughout the interwar years and aligned with Nazi Germany during World War II, a partnership that ultimately facilitated the deportation of hundreds of thousands of Hungarian Jews to Auschwitz in 1944. His authority rested on a carefully maintained conservatism that suppressed political extremes while tolerating and codifying discrimination at the state level. The regime he built made Hungary a willing participant in some of the war's most concentrated mass murder, even as Horthy himself later sought to negotiate a separate peace.