<P> A fourth faction claimed the best Italian was the one that the papal court adopted , which was a mix of Florentine and the dialect of Rome . Eventually , Bembo 's ideas prevailed , and the foundation of the Accademia della Crusca in Florence ( 1582 -- 1583 ) , the official legislative body of the Italian language led to publication of Agnolo Monosini 's Latin tome Floris italicae linguae libri novem in 1604 followed by the first Italian dictionary in 1612 . </P>
<P> A fourth faction claimed the best Italian was the one that the papal court adopted , which was a mix of Florentine and the dialect of Rome . Eventually , Bembo 's ideas prevailed , and the foundation of the Accademia della Crusca in Florence ( 1582 -- 1583 ) , the official legislative body of the Italian language led to publication of Agnolo Monosini 's Latin tome Floris italicae linguae libri novem in 1604 followed by the first Italian dictionary in 1612 . </P>
when did rome switch from latin to italian
when did rome switch from latin to italian
1612
1612