The Gospel of Luke and the Acts of the Apostles were both written by the same author, and are thus referred to as the Lucan texts.[75][76] The most direct evidence comes from the prefaces of each book; both were addressed to Theophilus, and the preface to the Acts of the Apostles references "my former book" about the ministry of Jesus.[citation needed] Furthermore, there are linguistic and theological similarities between the two works, suggesting that they have a common author.[77][78][79]