In this Catalan name, the first or paternal surname is Pi and the second or maternal family name is Margall; both are generally joined by the conjunction "i".
^"The first movement of the Spanish workers was strongly influenced by the ideas of Pi i Margall, leader of the Spanish Federalists and disciple of Proudhon. Pi i Margall was one of the outstanding theorists of his time and had a powerful influence on the development of libertarian ideas in Spain. His political ideas had much in common with those of Richard Price, Joseph Priestly, Thomas Paine, Jefferson, and other representatives of the Anglo-American liberalism of the first period. He wanted to limit the power of the state to a minimum and gradually replace it by a Socialist economic order." "Anarchosyndicalism" by Rudolf Rocker
^"These translations were to have a profound and lasting effect on the development of Spanish anarchism after 1870, but before that time Proudhonian ideas, as interpreted by Pi, already provided much of the inspiration for the federalist movement which sprang up in the early 1860s." George Woodcock. Anarchism: a history of libertarian movements. p. 357