Catholic, Orthodox (Coptic, Greek, and Russian), and Lutheran views (which I’ve included for regional reasons and because Lutherism is one of the earliest–perhaps the earliest–of the Protestant denominations). If I’ve left out a doctrinal view you prefer, feel free to post it in a reply–I’d love to see some other beliefs. Germanic/Pagan traditions
St. Patrick (Plus, some fact vs. fiction.
To learn more about this holiday and others like it, check out this Wikipedia article.