Final answer:
The type of writing that best describes Gabe's novel is a roman à clef.
Step-by-step explanation:
The term roman à clef best describes Gabe's writing. A roman à clef is a novel where real events and people are fictionalized by the use of invented names and places. In Gabe's case, he is using real events from the French Revolution but changing names and places to create a fictionalized version of the historical events.
Learn more about Writing about historical events with fictionalized elements