(1853–1930) and his second wife Maria Augusta Berglöf (1854–1922). Bull grew up and was mostly raised in Kristiania. At the age of 13, he lived for some time in Hurum in Buskerud, where his father worked as a journalist and editor. In 1899, he started gymnasium at Aars og Voss' skole. He attended Kristiania Cathedral School prior to his graduation from private school in 1902. After his graduation he lived with his family in Rome before returning to Kristiania in 1903 to begin his studies at the university.