St. Helena, the mother of Constantine the Great, was declared a saint before the official canonization process was instituted in the 12th century. She would have been declared asaint to the bishop by those who knew he rbest and were familiar with his life and merits. The local bishop would them make the decision. Today only the pope can declare saints after years of study by the Sacred Congregation for the Causes of Saints in the Vatican. The church does not create saints. Only God can do that. The Church "screens" candidates for sainthood to determine if they had a life worthy of emmulation. In other words, do they make good role models. Also, the Church has to be assured that the person is actually in Heaven. That is the reason that today a number of miracles must be verified before a person can be declared a saint.
No, he is not a canonized saint.
He was canonized in 1083 A.D by Pope Gregory
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.
Pope Benedict XV canonized Joan in May of 1920.
Saint Elisabeth of Hungary was canonized by Pope Gregory IX in the 1235.
Saint John Vianney was canonized by Pope Pius XI on May 31, 1925.
Saint Edmund Campion was canonized on October 25, 1970 by Pope Paul VI.
Yes. He was canonized on July 16, 1228, by Pope Gregory IX
Saint Teresa of Avila was canonized by Pope Gregory XV on March 12, 1622.
Saint Raymond of Penafort was canonized by Pope Gregory IX on March 29, 1601.