Pope Pius X is the only 20th Century pope canonized so far. However, there are 5 others who are at various stages of canonization: Pius XII, John XXIII, Paul VI, John Paul I and John Paul II.
No, he is not a canonized saint.
He was canonized in 1083 A.D by Pope Gregory
Sebastian was not canonized. He was proclaimed a saint by early Christians because of his martyrdom. The canonization process did not come into existence until the 12th century.
Priscilla was not canonized. She was declared a saint by the early Christian community long before the canonization process was instituted in the 12th century. Today, only the pope can declare a saint.
Benedict was canonized in the year 1220 by Pope Honorius III. --
She was canonized on December 8, 1933, by Pope Pius XI.
There was a Pope Leo XIII but he has not been canonized as a saint.
Leo was not formally canonized. He was proclaimed a saint by the early Christians. The canonization process was not instituted until about the 12th century.
Pope Alexander III officially canonized John the Baptist in 1173.
Pope Benedict XV canonized Joan in May of 1920.
Saint Elisabeth of Hungary was canonized by Pope Gregory IX in the 1235.
For about the first millennium of Christianity canonization was done regionally, so St. Patrick would have been canonized by his local Bishop. Formal canonization like we see today did not begin until 993 with Saint Ulrich who was canonized by Pope John XV.