St. Luke is one of the four evangelists in the Christian tradition, known for writing the Gospel of Luke and the Acts of the Apostles. He is often depicted as a physician, which is reflected in the compassionate nature of his writings. His Gospel emphasizes the importance of mercy, social justice, and the role of women in the early Christian community. Traditionally, St. Luke is believed to have been a companion of the Apostle Paul during his missionary journeys. His feast day is celebrated on October 18 in the Western Christian calendar. St. Luke is also the patron saint of physicians, surgeons, and artists, highlighting his diverse contributions to both faith and society.