Pope Pius XI

Pope Pius XI, born Ambrogio Damiano Achille Ratti, was the Bishop of Rome and supreme pontiff of the Catholic Church from 6 February 1922 to 10 February 1939. He also became the first sovereign of the Vatican City State upon its creation as an independent state on 11 February 1929. He remained head of the Catholic Church until his death in February 1939. His papal motto was "Pax Christi in Regno Christi", translated as "The Peace of Christ in the Reign of Christ".

31 May 1857

Born on the same birth day (31 May): Adye Douglas • Anatolij Bondarčuk • Andy Hurley • Clint Eastwood • David Leigh (scientist) • Howard Reig • Jerzy Radziwiłł (1556–1600) • John Robert Schrieffer • Lucile Godbold • Matthew Lodge • Pirkka-Pekka Petelius • Robert Gesink • Terry Waite

Born in the same month (May 1857): John Jacob Abel • Ronald Ross • Theo van Gogh (art dealer) • Theodor Curtius • William A. MacCorkle • Williamina Fleming