August 21 is the feast day of Pope Saint Pius X.
There is more than one Pope Pius who have assigned feast days so you should be more specific.Pope Pius I - Formerly July 11 but suppressed since 1969St. Pius V - April 30Blessed Pius IX - February 7St. Pius X - August 21Ven. Pope Pius XII - no feast day assigned yet.
Pope Leo XIII was the predecessor of Pope Pius X.
Pope Pius X was born on June 2, 1835.
Pope Pius X's name was Giuseppe Melchiorre Sarto.
Pope Pius X - as Pope, Joseph Melchiorre Sarto, was very much a traditionalist and sort to retrench from the modernist trends in Catholic doctrine in the early 20th century. After his death he was canonised as Saint Pius X - his feast day was originally set as September 3 before being moved by Pope John Paul II.
Pope Pius X became pope in 1903 following the death of Pope Leo XIII.
Pope Pius X's birth name is Sarto, Giuseppe Melchiorre.
Pope Saint Pius X was ordained a priest on September 18, 1858.
Pius X was pope from August 4, 1903, until August 20, 1914.
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 Saint Pius X was pope in 1912.