I’m currently reading, and very much enjoying, The Magicians of Caprona by Diana Wynne Jones. I’ve also checked out Howl’s Moving Castle, which has been snatched up by my darling wife.
The Magicians of Caprona is about two warring spell-houses in the fictional Italian City State of Caprona. The story mostly follows the younger siblings of the Montana house as they feud, Shakespear-style, with the Petrocchi family. It’s like the Capulets and the Montagues with wizard-powers and a heavy dose of political intrigue thrown in.
Below is an unrelated watercolored sketch from around the house: