He was elected on March 2, 1939.
There has never been a Pope Pius XS.
Pius XI was pope until he passed away on February 10, 1939. He was followed by Pius XII who became pope on March 2 of that year.
Pius VI
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.
He was consecrated on October 28, 1919.
Giovanni di Lorenzo de'Medici - Pope Leo X - became pope in 1513.
Nicholas von Flue was finally canonized in the year 1947!
Catherine of Siena was canonized in the year 1461 by pope Pius II.
He was made a cardinal in 1977 by Pope Paul VI.
In 1798 he was captured. In fact he also signaled a temporary break in the power of the Roman Church!
He was elected in the year 2005.
He was elevated to cardinal by Pope Paul VI on June 27, 1977.