Søren Kierkegaard (1813-1855) was a Danish philosopher and is considered to be the first existentialist, influencing such notable philosophers as Jean-Paul Sartre (1905-1980) and Martin Heidegger (1889-1976). His works are a reflection of alienation, angst, and absurdity, and include Either/Or (1843), Fear and Trembling (1843), and The Concept of Anxiety (1844).
This is a companion discussion topic for the original content at https://www.worldhistory.org/Soren_Kierkegaard/.