The Gospels fit the genre of ancient biographies. A biography was just about the only kind of work focused on a single character. Biographies fell within a very particular range of length: precisely that of the Gospels. Unlike dramas, they weren’t in poetry, they were written in prose. Biographies often started with or focused on the hero’s public career. If the person’s death was significant—say, a martyrdom—they would focus a lot on that, as we have in the Gospels.