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.
Saint Rita of Cascia was canonized on May 24, 1900, by Pope Leo XIII.
Some popes from the fifth century were St. Anastasius I, St. Innocent I, St. Zosimus, and St. Boniface I. Some additional popes from the fifth century were St. Celestine I, St. Sixtus III, and St. Leo I.
Pope St. Leo the Great died 10 November, 461.
St. Peter Claver died on September 8th, 1654, after a prolonged illness.
Pope Saint Leo the Great is not a patron saint.
Pope St. Leo I, the Great, in the 5th century.
St. Clare of Assisi was canonized on September 26, 1255, by Pope Alexander IV.
St. Etheldreda was canonized by Pope Celestine III in 1198.
Catherine was canonized in July of 1461 by Pope Pius II.
Pope Pius XI canonized More in 1935
Pope St. Leo I, the Great, is a Doctor of the Church but not considered a patron saint.
The feast day of Pope Saint Leo the Great is November 10.