St. Gregory was a pre-congregational saint and and was declared a saint by popular acclamation. At the time he died there was no formal procedure for canonization. That did not start until the 12th century.
Saint Gertrude of Helfta was a German Benedictine nun known for her spiritual writings and devotion to the Sacred Heart of Jesus. She was recognized for her piety, visions, and mystical experiences during her lifetime. After her death, her writings were widely read and she was eventually canonized as a saint by the Catholic Church in 1677.
There is no canonized saint named Madison.
Pope Saint Nicholas I, the Great, was canonized on May 8, 868, by Pope Adrian II.
Lionel is not a canonized Catholic Saint.
Helen Keller is not a canonized saint.
Catherine of Aragon is not a canonized saint.
Saint Albert became a saint in 1941. He became a saint because he was canonized by the patron saint of natural scientists and Pope Pius XI. Being canonized is when the Catholic Church declares a dead person, a saint.
Mary was not canonized. She was created a saint by God since she was destined to become the mother of His son.
Pius XI is not yet a canonized saint.
She has been beatified but is not yet a canonized saint,
Saint Dominic de Guzman: Canonized: 1234 Saint Dominic of Savio: Canonized: June 12, 1954 by Pope Pius XII
St. Boniface the Great was not canonized as the process did not exist at the time. He was declared a saint by the local Christian community based on the fact that he was martyred for his faith.