A story of St Francis
Have you seen this film? I was introduced to it recently and thought it was beautiful in so many ways.
https://m.imdb.com/title/tt0069824/
It is an artists impression of a life rather than a historians, but for more information about his life you could start here:
https://www.franciscanmedia.org/saint-of-the-day/saint-francis-of-assisi/