Friedrich Engels (28 November 1820 – 5 August 1895) was a German philosopher and organizer of the working class, and a friend and beneficiary of Karl Marx. He co-wrote the Manifesto of the Communist Party with Marx in 1848, and also wrote The Origin of the Family, Private Property and the State in 1884.
Influence on Marx
Marx knew little to nothing about economics before his work with Engels, who in turn knew little about philosophy. In a letter to Franz Mehring in 1892, Engels wrote: "Marx was then a Hegelian [...]. He knew nothing whatever about political economy and could not have had any idea about the meaning of a term like ‘economic form’." Their encounter inspired Marx to study economics and combining them with his philosophy.