Today the Church celebrates the holiday of St. Luke, the evangelist. Read his gospel and the acts of the apostles, which he starts of with these words:”Many have undertaken to draw up an account of the things that have been fulfilled among us, 2 just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. 3 Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me to write an orderly account for you, most excellent Theophilus, 4 so that you may know the certainty of the things you have been taught.” (Luk 1:1-4 NIV)

To find out more about him, read here:  http://en.wikipedia.org/wiki/Luke_the_Evangelist.