John Julius Norwich is a kind of modern day Gibbon in terms of his considerable literary style, but is a far better historian than Gibbon.
All of his books are excellent reads, as well as being admirably well informed and with a huge number of interesting and colourful details.
His writing is lively and is far more polished and characterful than most academic historians can manage and that is a good thing for all of us who are not students any more, although his books are good for history students who want to explore wider areas than their own specialisations.
This is one of the grand theme books that Norwich does so well, he is best on the machinations of the Italian peninsula here, a tangled topic at the best of times, but he brings clarity and wit to explaining the struggles of the Guelphs and Ghibelines as well as the dynastic intricacies of the Angevins, Normans, Aragonese and others.
He doesn't get bogged down in so much detail that the broad sweep journey is in danger of stalling, which for a casual reader is refreshing.
I own all of John Julius Norwich's books and this one is a good addition to his considerable and distinguished canon.