Someone told me there’s a Saint Ludicrous and his holiday is a week before Saint Patricks day. Is this true?
I’d say you’ve been whooshed. A Google search for “Saint Ludicrous” and “St. Ludicrous” turned up only this:
Which is clearly meant to be satiricial of you read the entire context here.
According to the contents page for Brian Doyle’s Saints Passionate and Peculiar (Winona, MN: St. Mary’s Press, 2002), there is a St. Ludicrus of Iowa, whose feast day is, fittingly, April 1. 
(The things you learn on this board! … )
Ah, spelling makes all the difference.
Uh, huh! A Catholic saint in Iowa, (who is mentioned in exactly one book in the world), whose name just happens to happens to be a homophone of ludicrous, and whose feast just happens to be on April 1?
From the St. Mary’s Press blurb on the book:Doyle reminds us that the facts are not the story, and fills the personality gap in the saintly saga with ‘Ludicrus of Iowa.’ It will not surprise the reader that this is Doyle’s own patron saint. . . .
No mention in the Big List of Patron Saints.
I hereby propose that we create, beatify and santify Saint Ludicr(o)us as the Patron Saint of SDMB.
I’ll second that. 
That Patron Saints list claims that one Dominic Savio is the patron saint of juvenile delinquients. It’s nice to know that when they’re keying cars and sniffing glue, Saint Savio is watching over them and giving them his blessing.