Vespasiano is the very thin thread holding this all together.
Everyone else gets their own little pen-portrait, together with all the events around Florence, and the wider Italian peninsula.
There's a lot on the sheer physical effort, organisation, and materials that go into creating manuscripts. Compare and contrast with the upcoming rival technology of printing, which occupies whole chapters.
Just for once the most illustrious artists, sculptors, and architects barely get a look in - so we're approaching the Renaissance from the humanist, classical revival point of view which is worth it for the contrasts.
Certainly worth the time to read.