Simone de Beauvoir (1908โ1986) was a French existentialist philosopher, intellectual, and social theoristย best knownย for her writings on existentialist ethics and feminist existentialism, as well as for her infamous polyamorous relationship with fellow French existentialist Jean-Paul Sartre. World-renowned for her metaphysical novelsย She Came to Stayย andย The Mandarins, de Beauvoir also wrote a number of essays on philosophy, politics, and social issues. Her diverse writings go on to include biographies, as well as her four-volume autobiography, made up ofย Memoirs of a Dutiful Daughter,ย The Prime of Life,ย Force of Circumstance, andย All Said and Done. In addition to her philosophical writing, de Beauvoir was an ardent feminist, her most famous philosophical work beingย The Second Sex, which is consistently referenced in the study of feminism.