Ti Alkire and Carol Rosen trace the changes that led from colloquial Latin to five major Romance languages, those which ultimately became national or transnational languages: Spanish, French, Italian, Portuguese, and Romanian. Trends in spoken Latin altered or dismantled older categories in phonology and morphology, while the regional varieties of speech, evolving under diverse influences, formed new grammatical patterns, each creating its own internal regularities. Documentary sources for spoken Latin show the beginnings of this process, which comes to full fruition in the medieval emergence...