Ignatius was born in
Pori, the son of
vice-pastor Johan Ferdinand Ignatius and Sofia Fleming. He
graduated secondary school in 1855 and enrolled in the
Imperial Alexander University in Helsinki, gaining his undergraduate and graduate degrees in 1860, a
Licenciate degree in 1862 and finally his Ph.D. in 1864. Ignatius worked as a civil servant in the Finnish Main Office of Statistics from 1865 to 1868 and then as the head of the office from 1868 to 1885. He was the head of the chamber committee of the Senate of Finland during 1885–1900 and 1905–1908. Ignatius worked also as a
Docent of Nordic History and Statistics from 1865 to 1870 and as the Curator of the
Western Finland's Student Nation (combination of
Turkulainen and
Satakuntalainen Osakunta during 1846–1904) from 1868 to 1870. Ignatius took part in the
Diet of Finland as a member of the
burghers estate in 1877–1885 and 1904–1905. He was also a member of the
Helsinki City Council during 1875–1878 and 1903–1905. Ignatius was among of the founders of both the Finnish Historical and Geographical Societies, was a committee member of the Society for Culture and Education (
Kansanvalistusseura) during 1873–1887 and was the Chairman of the Finnish Antiquarian Society in 1875–1885. He died in
Helsinki, aged 71. ==Family==