Who was born in 1820

Dutch author, civil servant, and colonial administrator best known for his novel Max Havelaar, which exposed the abuses of colonialism in the Dutch East Indies

French photographer, balloonist, caricaturist, and journalist who took the first aerial photographs and whose portraits are held in major national collections

German philosopher, sociologist, and economist who co-authored The Communist Manifesto with Karl Marx and developed the political and philosophical system known as Marxism