But this theory of Roscelin's had no connection with the abstract concept of genus and species. He did not touch on this question. It is certain that he did not deny the existence or possibility of these concepts, and he was therefore not a nominalist in the fashion of Taine or in the sense in which nominalism is now understood. That is why, in reference to the modern sense of the word, some call it a pseudo-nominalism. John of Salisbury, speaking of "nominalis secta" (Metalog., II, 10), gives it quite another meaning. So Roscelin's rudimentary, even childish, solution does not compromise the value of universal concepts and may be called a stage in the development of moderate realism. However, because of his position as the first medieval philosopher to challenge medieval Realism, he has been invoked as a forefather of modernity.