https://en.wikipedia.org/wiki/Swiss_Guard
https://www.vatican.va/content/romancuria/en/guardia-svizzera-pontificia/corpo-della-guardia-svizzera-pontificia/profilo.html

https://en.wikipedia.org/wiki/War_of_the_League_of_Cognac
https://en.wikipedia.org/wiki/Sack_of_Rome_(1527)