Pius X was pope from August 4, 1903, until August 20, 1914.
There has never been a Pope Pius XS.
Apparently, Pius V did not canonize any saints during his reign as pope.
His reign as pope began February 6, 1922.
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
If by "leader" you mean "the pope," then the leader of the Catholic Church in 1958 was either Pope Pius XII, who's reign ended in that year, or Pope John XXIII, who succeeded Pope Pius XII in that same year.
Pope Pius XII followed Pius XI.
It was Pius XII. He was pope from Mar. 2, 1939 to his death on Oct. 9, 1958.
There were three popes during Queen Victoria's reign (1837-1901): Pope Gregory XVI (1831-1846) Pope Pius IX (1846-1878) Pope Leo XIII (1878-1903)
Pope Pius I died in 154.
There has never been a Pope Pius XVI. Pius XII was the last pope by that name.
The longest reigning pope Pius IX (Pio None) (Giovanni Maria Mastai-Ferretti) reigned from 16 June 1846-7 to Feb 1878.
Pope Pius XII is 6'.