Pope Pius XI (31 May 1857 – 10 February 1939), born Ambrogio Damiano Achille Ratti, was Pope from 6 February 1922, and sovereign of Vatican City from its creation as an independent state on 11 February 1929 until his death on 10 February 1939. He issued numerous encyclicals including Quadragesimo Anno, highlighting capitalistic greed of international finance, and social justice issues, and Quas Primas, establishing the feast of Christ the King. He took as his papal motto, "Christ's peace in Christ's kingdom".