Sibelius was born in Hämeenlinna in Grand Duchy of Finland in the Russian Empire, the son of the Swedish-speaking doctor Christian Gustaf Sibelius and Maria Charlotta Sibelius née Borg.
Sibelius was born in Hämeenlinna in the Grand Duchy of Finland, an autonomous part of the Russian Empire. He was the son of the Swedish-speaking medical doctor Christian Gustaf Sibelius and Maria Charlotta Sibelius née Borg.