Summary: Luke establishes historical, political, and spiritual context for Jesus, including a list of Roman rulers, the ministry of John the Baptist before Him, and his genealogy with such names as David, Jacob, Noah, and Adam.
Response: I believe Luke does this to catch everybody up. Romans will figure out when in the political scale He was there. New Christians can figure out His message, even if right now it's "don't be greedy." Lifetime Jews will trace his lineage, knowing full well the back half (at least) of that line. So Lord, help me to reiterate in my head: You are true.