Final answer:
In Edmond Rostand's play "Cyrano de Bergerac", the "bold, unwelcome visitor" that delayed Cyrano is a group of bandits, which is part of a story he tells Roxane.
Step-by-step explanation:
The "bold, unwelcome visitor" that Cyrano refers to as the reason for his delayed arrival at Roxane's convent is not explicitly mentioned in any of the provided text excerpts.
However, if we reference Edmond Rostand's play "Cyrano de Bergerac", it is a group of bandits that Cyrano claims to have detained him, which is orchestrated as part of the story he tells Roxane. This fictional delay is one of Cyrano's many embellishments and acts of grandiosity throughout the play.