After consulting with all bishops a nearly unanimous approval was obtained and the belief was finally defined in 1950 and made an article of faith. For more information, see the link from the Vatican below.
This doctrine was dogmatically defined by Pope Pius XII on November 1, 1950.
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
Pope Pius XII followed Pius XI.
It was Pius XII. He was pope from Mar. 2, 1939 to his death on Oct. 9, 1958.
Pope Pius I died in 154.
There has never been a Pope Pius XVI. Pius XII was the last pope by that name.
Pope Pius XII is 6'.
Which Pope Pius? There have been 12 of them.
Pope Pius I was born in 0##.
Pope Leo XIII was the predecessor of Pope Pius X.
There has never been a Pope Pius XS.
Pope Pius I was the 10th pope.