Short answers, pulled from the story.
Giovanni Dalmata, born Ioannes Stephani Duknovich de Tragurio and also known as Ivan Duknović, was a sculptor from Trogir, Dalmatia, who lived from around 1440 to around 1514. He worked mainly in Rome, Hungary, and his native Dalmatia during the Renaissance, and was counted among the leading sculptors active in Rome in the second half of the 15th century.
In Rome, Giovanni Dalmata worked on the Palazzo di Venezia for Pope Paul II and created a tomb monument for Paul II in St. Peter's, since dismantled. He also made the tomb of Cardinal Bartolomeo della Rovere in San Clemente, the tomb of Cardinal Bernardo Eroli now in the Grotte Vaticane, and the Tempietto of S. Giacomo in Vicovaro near Tivoli.
Giovanni Dalmata worked at the court of King Matthias Corvinus in Buda from around 1488 to 1490. His works from this period, including the Fountain of Hercules in Visegrád, were later destroyed or badly damaged.
Giovanni Dalmata was born around 1440 in Vinišće, a Dalmatian village in Venetian Dalmatia now part of Marina. His father, Stjepan Duknović, was a stonemason in Trogir.
A marble relief of the Virgin and Child, offered for sale at London's Katz gallery, was bought by Trogir City Museum for two hundred and fifty thousand pounds. The authenticity of this work as a genuine Giovanni Dalmata piece remains doubtful.
Giovanni Dalmata was born Ioannes Stephani Duknovich de Tragurio and was also known as Ivan Duknović, Giovanni Duknovich di Traù in Italy, and Ivan Stjepanov Duknović in Croatia. Documents from 1513 and 1514 refer to a Magistro Joanni lapicida in Trogir, believed to be the same person.