What is the nickname for Ireland, often associated with St Patrick's Day?

https://www.livingshamrock.com/pages/shamrock-story

According to the ledgend, what did St. Patrick use to explain the Holy Trinity?

https://discover.hubpages.com/holidays/St-Patricks-Day-Truth-or-Fiction     #14

https://discover.hubpages.com/holidays/St-Patricks-Day-Truth-or-Fiction  #11

https://time.com/6957676/st-patricks-day-facts-history-true-story/

https://www.biography.com/religious-figures/st-patrick-little-known-facts

https://discover.hubpages.com/holidays/St-Patricks-Day-Truth-or-Fiction

https://parade.com/1165519/marynliles/st-patricks-day-trivia/  #45

The belief that wearing green will make you invisible to leprechauns

To remind you that Green is worn for good luck

Because green is not the actual color of this holiday