I am not sure what you mean by your question. Peter was the first pope and is a saint. However, he was declared a saint before the official canonization process was in place. That process was not firmly in place until the 12th century. The first person to be canonized a saint by a pope was Saint Udalric, Bishop of Augsburg, who was canonized by Pope John XV in 993. Some historians maintain that the first such canonization was that of Saint Swibert by Pope Leo III in 804. The last person to be named a saint by someone other that a pope was Walter of Pontoise who was canonized by Hugh de Boves, the Archbishop of Rouen in 1153. Thereafter, all canonizations were made through the Vatican and the pope.
Here's what Wikipedia says about it:
"The canonization of Saint Udalric, Bishop of Augsburg, by Pope John XV in 993 is the first undoubted example of a papal canonization of a saint from outside Rome. Some historians maintain that the first such canonization was that of Saint Swibert by Pope Leo III in 804. Thereafter recourse was had with greater frequency to the judgment of the popes. Walter of Pontoise was canonized by Hugh de Boves, the Archbishop of Rouen in 1153; Walter was the last saint in Western Europe to have been canonized by an authority other than the pope."
That is hard to answer. St. Joseph, St. Anne, St. Joachim, John the Baptist and his parents are all called Catholic Saints who were all dead before Our Lord was crucified. However, the first KNOWN saint who died shortly after Our Lord's Crucifixion, Resurrection and Ascension was St. Stephen the Martyr. Since all the previously named persons died as Jews, I guess Stephen is the first to die as a Catholic.
Pope Pius X is the only 20th century pope to be canonized to date. There are several others who have causes for canonization, however.
St. Peter was the first pope named as a saint but he was not officially canonized. That process was not established for nearly 1100 years after Peter died.
He was canonized in 1083 A.D by Pope Gregory
The last pope to be canonized was Pius X.
Benedict was canonized in the year 1220 by Pope Honorius III. --
Pope Benedict XV canonized Joan of Arc in 1920.
Pope John Paul II canonized about 480 saints.
She was canonized on December 8, 1933, by Pope Pius XI.
Pope Benedict XV canonized Joan in May of 1920.
Saint Elisabeth of Hungary was canonized by Pope Gregory IX in the 1235.
No, he is not a canonized saint.
The Pope Honorius 111
Saint Edmund Campion was canonized on October 25, 1970 by Pope Paul VI.
Canonizations occur every few months so anything listed here would soon become obsolete. A list of recent canonizations can be found at this link.