Another 'I never noticed that before' moment about Luke-Acts.  I was reading ahead the Roots Advent material which begins Luke as it's Yr 3 of the RCL.  The preliminary notes observed that, as well as a deal of parallelism (Jesus & John, Peter & Paul) Luke's narrative is firmly set in the context of Rome... beginning pretty much with the Roman census (we'll not divert into historicity debates) and ending with Paul in Rome.  Interesting as 'brackets' or 'bookends' for this narrative.