Pronouns with open inventories? The history of Spanish grammar presents relatively often displayed works with paradigms of certain types of pronouns (quantifiers and indefinite) in wich to enumerate the elements that make up the category, the author, after listing a few, writes 'etcetera' unable to make a full and comprehensive relationship of the members that make up the category. Also there are many grammars in which there are large differences between the lists of words that make up these categories. It seems that the inventories of these kind of words are not closed as the personal, possessive or demonstrative pronouns are; or at least there is no unanimity among scholars about what are the words which make up these categories. The kind of words we usually call pronoun needs an accurate review in order to avoid that units not meeting the accurate requirements are included in this grammatical category. In this paper I try to make an analysis throughout the grammar history of words often included in these categories in order to see if, actually, they have the right to be part of what is usually named in linguistic terminology 'pronoun'.