Finding sources in the context of Pantomime was surprisingly more difficult than I predicted. I do have some books on the way that will hopefully add to the notes I've taken on Pantomime's background. Still, the sources I have so far have pretty good information as to where Pantomime originated. The Cambridge Illustrated History of British Theatre made it clear that British Pantomime did not develop in England. In The Story of Pantomime, they make the prediction that Pantomime originates from the Ancient Romans, where they had feasts called Saturnalia that were celebrated at the same time as Christmas today. Just like in Pantomime, people would cross-dress in the performances. Many years later, French Harlequins (or clowns) became popular and possessed many of the physical and silly attributes seen in Pantomime. Harlequins then translated into 'Italian Night Scenes' where they performed some Commedia del' Arte and many slapstick performances in England. Because British people enjoyed these performances so much, they took the elements they liked and tweaked them into the Pantomime theatre tradition. The information above is a basic summary of the information I took notes on, and I'm not sure how accurate it is. I'm kind of worried about my struggle to find good sources, but I hope once I get my books, the information that I wasn't sure about would make more sense.
Hughes, Maureen. A History of Pantomime. Pen & Sword History, 2013. Google
Books, Pen & Sword History, www.google.com/books/edition/
Accessed 2 Mar. 2021.
Trussler, Simon. The Cambridge Illustrated History of British Theatre. Cambridge
UP. Google Books, Cambridge UP, www.google.com/books/edition/
cover. Accessed 2021.
MACQUEEN-POPE, W. "THE STORY OF PANTOMIME." Journal of the Royal Society of
Arts, vol. 105, no. 5002, 1957, pp. 456–458. JSTOR, www.jstor.org/
stable/41366062. Accessed 4 Mar. 2021.