Initially raised by his maternal grandmother, Rosetti was then sent to various schools, and in 1890 was studying at Andrei Șaguna High School in Brașov, then under Austro-Hungarian rule.
Crescut inițial de bunica maternă, Rosetti a fost apoi trimis la diferite școli, iar în 1890 a studiat la Liceul Andrei Șaguna din Brașov, pe atunci aflat sub dominație austro-ungară.