Saint Gregory, also known as Saint Gregory the Great, was a pope and a significant figure in the early Christian Church. He served as pope from 590 to 604 AD and is known for his contributions to church administration, liturgy, and the promotion of monasticism. He is also credited with the Gregorian Chant, a style of plainchant used in the Roman Catholic Church. Saint Gregory is recognized as a Doctor of the Church, a title given to saints whose teachings have greatly influenced Christian doctrine. His feast day is celebrated on September 3rd, and he is often depicted in art with a dove, symbolizing the Holy Spirit, guiding him in his work.