Gradenigo devoted to politics very early in his life, acting as podestà of Ragusa and Capodistria, as well as procuratore in the capital.
Born in Capodistria (modern Koper, then part of the Republic of Venice), he was the son of Antonio Trevisani, an architect, by whom he was instructed in the first rudiments of design.
According to Pietro Valente, Cobolli Gigli was born from Nicolò Cobol (Capodistria 1861 - Trieste 1931), elementary school teacher and Italian irredentist, to which Trieste has dedicated a Karst trail (the Napoleon) for his creation of municipal recreation centers during the Habsburg times.
The Venetians completed the occupation of Friuli capturing Feltre, Belluno, Portogruaro and Venzone in 1420, while the Cadore and Capodistria surrendered spontaneously.
The Gravisi family of Koper (Capodistria) has held the title of Marquis of Pietrapelosa since 1440, when Nicolò Gravisi was given the title and the estate of Pietrapelosa