Primary or secondary sources of a story/legend (during the middle
ages) about the rescue of the population of a French village from a
flood through (invention and) construction of a "pontoon bridge"
('passerelle de ponton' in French) by a youth possibly named Saint
Germain, whose name was subsequentlly
accorded the honorific Saint Germain du Ponton as an expression of
gratitude by the villagers.