John of Nepomuk was the first martyr of the Seal of the Confessional, being drowned in 1393 in the Vltava river at the behest of Wenceslaus, King of the Romans and King of Bohemia, because, as the confessor of the queen of Bohemia, refused to divulge the secrets of the confessional. In 1719, when the Roman Catholic Church declared the tongue of John of Nepomuk to be "incorruptible", was started the work to a church in Zelena Hora (Gruenberg), near the border between Bohemia and Moravia, where the future saint had received his early education. It was consecrated immediately after John's beatification in 1720, although construction works lumbered on until 1727.
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