Interestingly, one of the main clues to the location of the Holy Grail (which itself has several different meanings) is in a poem written by Jean Cocteau called in English "The Red Serpent". One paragraph of the poem talks about the Children of St. Vincent!
In 1604 Samuel Champlain while exploring the coast of Nova Scotia at what is now called Digby Neck had a priest who evidently had forgotten his sword while on shore. When he went to find it he became lost and remained lost for 17 days, in an area that I have always considered the current hiding place of the Grail, near Annapolis Basin. The strange part of this story is that during the same period this priest was in Nova Scotia, Vincent de Paul claimed he had been captured by pirates and was held for two years before he converted his Moorish Captor to Christianity and was released.
To be sure, there is a one year discrepancy in the dating, but the story is still interesting and the dating of the capture of de Paul was determined by himself. And for instance who would leave a sword behind accidentally and how easy would it be to convert a Moor, the story as de Paul told it to the Pope does not make much sense?
Cheers, Loki