This document provides biographical information about Saint Luke, the author of the Gospel of Luke and the Acts of the Apostles. It states that Luke was a Greek physician who traveled with and assisted Saint Paul. Luke is credited as the first historian of Christianity and incorporated eyewitness testimony into his gospel and Acts. The document discusses Luke's special focus on themes of mercy, forgiveness, and the inclusion of Gentiles. It provides details on Luke's travels with Paul and eventual martyrdom. The document also notes artistic traditions associated with Luke and feast days in his honor.