Final answer:
The missing word in the sentence is likely 'ball,' implying a royal event taking place in a confinement setting, which is juxtaposed with freedom, a common theme in literary works.
Step-by-step explanation:
The referenced texts describe various scenarios involving royalty, prisoners, and masquerades. Considering the provided excerpts, the missing word in the sentence 'The prince host a masked ______ while locked in the prison.' is most likely 'ball'. In historical contexts, a ball would be a formal gathering or dance hosted by someone of royal or noble status.
The sentence suggests an unusual scenario of a prince hosting a social event while being imprisoned. This could reflect dramatic irony or be from a work of fiction where such an event provides a compelling contrast between freedom and confinement.