As a child, two of his greatest friends were the Croat Petar Klaić and the Serb Dušan Baljak.

During his time in Austria, and with the influence of other Dalmatian Italians from the province irredente, he started to develop nationalistic feelings.

[1][3] Although he was open to make some concessions to the Slavs, Ghiglianovich endeavored to get at least Zara annexed to Italy.

[1] He endeavored against the "process of discrimination actuated by the municipalities in Croatian hands,"[1] thus attempting to preserve the Italian language in schools and in the public administration.

Ghiglianovich, who became judge at the Supreme Court of Cassation, was then nominated Senator of the Kingdom of Italy on November 15, 1920.