Friedrich Engels was born in Barmen-Elberfeld (Kingdom of Prussia), currently Wuppertal, Rhineland, November 28, 1820. Friend and collaborator of Karl Marx, was co-author with him of fundamental works for the birth of the socialist movement, communist and trade union . He cultivated a close friendship with Marx, recognizing superior theoretical capacity and greater originality in ideas. Engels was the breadwinner of Marx, which he kept with his family during the years when he wrote Capital. Engels died in London on August 5, 1895.