114. Under this head will be treated not only pronouns and pronominal
adjectives, but also articles.
115. In popular Latin the personal, possessive, and demonstrative
pronouns and adjectives had two sets of forms, according as they
were accented or unaccented (§ 19). _Ille_, when stressed and used
pronominally, became a disjunctive personal pronoun of the third
person; when unstressed and used pronominally, it furnished the
conjunctive forms of the third person; when unstressed and used
adjectively, it developed into a definite article. _Ipse_ had similar
uses. These differentiations must have begun in Vulgar Latin times.
116. The declension of _ĭlle_ was considerably altered in Vulgar Latin.
The neuter _ĭllud_ disappeared, being replaced by _ĭlium_. Through the
influence of _quī_ _cūjus_ _cūī_, ✱_ĭllī_ _illūjus_[89] _illūī_[89]
came to be used beside _ĭlle_ _illīus_ _ĭllī_. The feminine had, beside
_illīus_ _ĭllī_, a genitive and dative _ĭllæ_; through the analogy of
_illūjus_ _illūī_, _ĭllæ_ was expanded into _illæjus_[89] _illæi_.[89]
_Illīus_ then went out of use. In the plural, _illōrum_ (which in some
regions, by the analogy of _illūjus_ _illūī_, had a form ✱_illūrum_)
crowded out _illārum_; this _illōrum_ came to be used also as a dative.
_Ipse_ and _ĭste_ followed in the main the same course as _ĭlle_.