Saint Francis of Assisi (1182-1226) was the founder of the Franciscans and is the patron saint of animals and the environment. He also arranged for the first live nativity scene in Greccio, Italy, in 1223. You can read more about his life in these books: https://tinyurl.com/StFrancisOfAssisiBooks and these articles: https://tinyurl.com/StFrancisOfAssisiArticles.

(Photo © Fred de Noyelle I Godong accessed at https://aleteia.org)