Feuerbach and Bauer (whom Marx followed to Bonn) were early influences among the ‘Young Hegelians’ Marx met when studying in Berlin, arguing against Hegel’s dominant views. Hess and Herwegh were also among this circle — most of whom Marx ended up drifting away from. Engels was his great lifetime friend, collaborator and financial supporter, who really interested Marx in communism. Marx considered his friend Heine not only a poet, but a fighter. Proudhon impressed him strongly, but their friendship was short. Marx wrote to ask Darwin if he could dedicate ‘Capital’ to him, but they never met.