I love the hagiography of early Irish & Welsh saints. You’re like. Did most of these people exist? Probably not. Did any of these events occur? Also probably not.
Then you find out there are many, many, first hand accounts of Irish monks making it to Iceland and the Faroe Islands centuries before the Vikings and there are written accounts of the curses early Irish missionaries put on people and you’re like. Okay. Maybe it’s not that crazy. Maybe St. Brendan did find the Isle of the Blessed and give communion to a mermaid, or something mermaid shaped.