Saint John NEPOMUK was a priest (Vicar General of the Archbishop) in Bohemia who died a martyr's death in Prague in 1393. He was thrown from Prague's Charles Bridge into the Vltava River on royal orders and drowned. His statue can still be found on many bridges today. Churches or chapels dedicated to him are much rarer, as is the case here.
John Nepomuk is not only considered a popular "bridge saint", but is also the patron saint of the seal of confession. In many depictions of his person he holds a cross in one hand, sometimes he puts a finger to his lips with the other as a sign of silence (which was heard during confession).
The memorial day of Saint John Nepomuk in the calendar of saints is March 20th.