Although Italo-Romance varieties continue to be documented, classified, and analyzed by dialectologists, many are at risk of not being recorded thoroughly and systematically before their imminent extinction. While considerable attention has been devoted to the phonetics, phonology, morphosyntax, and lexicon of the more archetypal Romagnol dialects spoken in the Po Valley, dialectologists have largely overlooked peripheral Romagnol varieties such as Sammarinese. The present dissertation begins to fill this lacuna in Italian dialectology by providing an historical and synchronic study of Sammarinese phonology and morphology based on the examination of old and modern texts as well as copious oral data. The main purpose of the thesis is to delineate diatopic variation within the tiny Republic through comparative analysis, while also addressing the need for a more complete and precise definition of Sammarinese‘s position in the Romagnol linguistic group. In addition to confirming Sammarinese‘s status as a Borderline Romagnol variety, the dissertation offers evidence that Sammarinese is divided geographically into two main dialectal groups: Northeastern and Southwestern. The secondary intent of the thesis is to provide systematic, comprehensive, and phonetically precise documentation of the phonology and morphology of a moribund language. iii The dissertation consists of five chapters. The Introduction includes a brief linguistic history which relates diatopic variation to geopolitical factors. The first chapter also contributes an assessment of the status of scholarship dedicated to Sammarinese dialectology. Chapter 2 examines diachronic phonetics, emphasizing the dichotomy between the traits which link Southwestern Sammarinese to Borderline Romagnol and those which join Northeastern Sammarinese with the Romagnol varieties of the Po Valley. Chapter 3 treats synchronic phonetics and proposes a generative phonology which aims to identify the diasystem underlying phonetic variation within the Republic. Chapter 4 analyzes historical declensional morphology, underscoring diatopic variation in internal flexion configurations as further evidence of the division between Northeastern and Southwestern Sammarinese. Chapter 5 examines diachronic verb morphology. The dissertation concludes with an assessment of linguistic aspects meriting further research and analysis.

Although Italo-Romance varieties continue to be documented, classified, and analyzed by dialectologists, many are at risk of not being recorded thoroughly and systematically before their imminent extinction. While considerable attention has been devoted to the phonetics, phonology, morphosyntax, and lexicon of the more archetypal Romagnol dialects spoken in the Po Valley, dialectologists have largely overlooked peripheral Romagnol varieties such as Sammarinese. The present dissertation begins to fill this lacuna in Italian dialectology by providing an historical and synchronic study of Sammarinese phonology and morphology based on the examination of old and modern texts as well as copious oral data. The main purpose of the thesis is to delineate diatopic variation within the tiny Republic through comparative analysis, while also addressing the need for a more complete and precise definition of Sammarinese‘s position in the Romagnol linguistic group. In addition to confirming Sammarinese‘s status as a Borderline Romagnol variety, the dissertation offers evidence that Sammarinese is divided geographically into two main dialectal groups: Northeastern and Southwestern. The secondary intent of the thesis is to provide systematic, comprehensive, and phonetically precise documentation of the phonology and morphology of a moribund language. iii The dissertation consists of five chapters. The Introduction includes a brief linguistic history which relates diatopic variation to geopolitical factors. The first chapter also contributes an assessment of the status of scholarship dedicated to Sammarinese dialectology. Chapter 2 examines diachronic phonetics, emphasizing the dichotomy between the traits which link Southwestern Sammarinese to Borderline Romagnol and those which join Northeastern Sammarinese with the Romagnol varieties of the Po Valley. Chapter 3 treats synchronic phonetics and proposes a generative phonology which aims to identify the diasystem underlying phonetic variation within the Republic. Chapter 4 analyzes historical declensional morphology, underscoring diatopic variation in internal flexion configurations as further evidence of the division between Northeastern and Southwestern Sammarinese. Chapter 5 examines diachronic verb morphology. The dissertation concludes with an assessment of linguistic aspects meriting further research and analysis.

This thesis describes and analyses patterns of complementation and auxiliation in the languages spoken in an understudied area of Italy, namely Southern Lazio. From a descriptive perspective, this thesis serves to document several severely endangered Romance languages spoken in the Italian peninsula. In so doing, several previously undocumented complementizer and auxiliary systems are illustrated for the first time. From a theoretical perspective, this thesis accounts for the patterns of variation found in these auxiliary and complementizer systems. Traditional descriptions of Italo- Romance treat these systems as entirely unrelated. Indeed, to date, no previous study has compared the distribution of complementizers and auxiliaries in Italo-Romance to investigate similarities and correspondences between them. This dissertation takes the original step of demonstrating that the distribution of particular auxiliary systems correlates with the distribution of particular complementizer systems, offering, in turn, an integrated and complementary theoretical analysis of both phenomena.