Variation in the Gallo-Romance left periphery

Exploiting parallels between nominal and clausal structures, it is argued that the strong / weak D dimension of parametric variation for nominals can be extended to clauses, such that V2 syntax can be reinterpreted as the reflex of a strong C setting. On this view, we observe in the history of most Gallo-Romance varieties a parametric shift from strong to weak C manifested in the loss of generalized V-to-C movement and the concomitant reassignment of the EPP edge-feature from CP to TP, as witnessed in the emergence of a dedicated preverbal subject position and reversal in the null-subject parameter. Within this scenario, it is shown that Gascon represents a major exception having uniquely retained its medieval V2 syntax and, indeed, further extended it to embedded contexts. In particular, in the passage from medieval to modern Gascon, the grammar has witnessed a radical change in the formal realization of the strong C head requirement (while the accompanying EPP edge-feature remains unchanged) such that strong C is no longer satisfied through the Move option raising the finite verb to the C position, but through the Merge option directly lexicalizing the latter position with a so-called ‘enunciative’ particle. This development is the result of intensive contact with Basque, a language independently known to present similar preverbal particles, highlighting how the medieval Gallo-Romance V2 constraint was exceptionally reinforced in this area, but at the same time aligned with a Basque model triggering a shift from the Move to the Merge options in satisfaction of strong C and the emergence of an elaborate system of C-particles.