What is learned, in this section, about Bishop Aringarosa's role in the story and what role might he play in future events as a result?

This section features Bishop Aringarosa's arrival in Rome and tells of him being shuttled to a location off the Vatican grounds, the Castel Gandolfo, which houses the Vatican's Astronomy Library and often secret meetings. The Bishop thinks about a meeting held there five months ago, but no further description or content of that meeting is revealed, other than it put a deadly chain of events in motion. The implication is that the secret meeting started the entire chain of events leading to the death of Jacques, the Sister and unknown others. So, this implies that Aringarosa will play an even bigger role in the violent side of the story as things progress.