He was born in the city of
Trieste, at the time the Austrian
Imperial Free City of Trieste. Oberdan was baptized
Dionisio Guglielmo Carlo. His first name was that of his grandfather. Guglielmo was indeed his second name, given to him in honour of his godfather, Guglielmo Rossi. His mother was a Slovene woman from
Šempas (, ) in the
County of Gorizia and Gradisca, while his father, Valentino Falcier, was a Venetian soldier in the
Austrian army (though in the civil registers of Trieste he is indicated as a baker). The original form of his mother's surname was
Oberdank (or
Oberdanch), later Italianized by Guglielmo Oberdan himself into
Oberdan. Oberdan's biographer reports that it is only through the latter form that during the years some Slovenian nationalists have claimed him as of "their own blood". His father was originally from
Noventa di Piave; he lived his last years in
Venice, where he died in 1878. He did not acknowledge his son, so Guglielmo took his mother's surname. He was raised by his mother and stepfather, Francesco Ferencich (Slovene) whom his mother married when Oberdan was four years old. There were some rumors that his stepfather mistreated him, which are dismissed by Oberdan's biographer
Francesco Salata, who instead remarks on their good relationship, reporting that his stepfather made no distinction between Oberdan and his other sons, with Oberdan calling him and writing him affectionate letters during his stay in Rome, and stating in his last letter from prison before execution that the visit of his stepfather was of "great consolation", in addition to thanking him for everything. He was educated in an
Italian cultural milieu, embraced irredentist ideas and Italianized his name to "Guglielmo Oberdan". In 1877 he enrolled at
Vienna's College of Technology (now
Vienna University of Technology) where he studied engineering. As he supported the idea of independence for all of the empire's national groups he resented the
occupation of Bosnia-Herzegovina by Austria-Hungary and therefore deserted from the
Austro-Hungarian Army because he did not want to take part in military activities there. Instead, he fled to
Rome to continue his studies. In the Italian capital he adopted
irredentist ideas, aiming at the annexation to Italy of the Italian-speaking lands still under Austro-Hungarian rule. In 1882 he met with irredentist leader and co-founder
Matteo Renato Imbriani. It was then that he came to the conviction that only radical acts of
martyrdom could bring the liberation of Trieste from Austrian rule. == Assassination attempt ==