Pierre-Joseph Proudhon (January 15, 1809 – January 19, 1865) was the first proclaimed anarchist of the 19th century.
He is most famous for asserting "Property is theft".
Proudhon also claimed that "Property is impossible." Although he was against capitalism, he rejected communism and believed that individual possession — which he distinguished from private property — was necessary both for liberty and for an efficient economy.
Another one of his famous statements is that "anarchy is order". This statement is believed by some to be the source of the circled-A.