Some of encyclicals written by Pope Pius XI are Quadragesimo Anno and Quas Primas.
12 popes have taken the name "Pius". Some of them were also canonized as saints. Pope Pius I, saint, Pope 140/142 to 155 Pope Pius II, Pope 1458 to 1474 Pope Pius III, Pope in 1503 Pope Pius IV, Pope 1559 to 1565 Pope Pius V, saint, Pope 1566 to 1572 Pope Pius VI, Pope 1775 to 1799 Pope Pius VII, Pope 1800 to 1823 Pope Pius VIII, Pope 1829 to 1830 Pope Pius IX, Pope 1846 to 1878 Pope Pius X, saint, Pope 1903 to 1914 Pope Pius XI, Pope 1922 to 1939 Pope Pius XII, Pope 1939 to 1958
There has never been a Pope Pius XVI. Pius XII was the last pope by that name.
Pope Pius X's birth name is Sarto, Giuseppe Melchiorre.
Pope Pius V
Pope Pius XI's birth name is Ambrogio Damiano Achille Ratti.
Pope Saint Pius I was the tenth pope.
Pope Pius X's name was Giuseppe Melchiorre Sarto.
Pope Pius XI chose his own name, as all popes do. It was an indication that he had much admiration for his predecessor, St. Pope Pius X, and planned to carry on with his policies.
Pope Pius XII's birth name is Pacelli, Eugenio Maria Giuseppe Giovanni.
Because that was the name he chose when he was elected as pope.
Yes, there have been 12 popes named Pius.
The last pope to be canonized was Pius X.