Summary from Wikipedia

His origins were primarily Italian. He was born in Ljubljana, Slovenia, then part of the Kingdom of Serbs, Croats and Slovenes. His family were Slovene immigrants from the Slovenian Littoral, which was under Italian administration. His father was from the village of Volčji Grad near Komen in the Karst region, while his mother came from the Slovene community in Trieste (now in Italy). The family lived in Trieste until the Fascist takeover in 1922, when they fled to the neighboring Kingdom of Serbs, Croats and Slovenes.[1]